Company Quick10K Filing
Quick10K
Suntrust Banks
Closing Price ($) Shares Out (MM) Market Cap ($MM)
$63.40 444 $28,140
10-Q 2019-03-31 Quarter: 2019-03-31
10-K 2018-12-31 Annual: 2018-12-31
10-Q 2018-09-30 Quarter: 2018-09-30
10-Q 2018-06-30 Quarter: 2018-06-30
10-Q 2018-03-31 Quarter: 2018-03-31
10-K 2017-12-31 Annual: 2017-12-31
10-Q 2017-09-30 Quarter: 2017-09-30
10-Q 2017-06-30 Quarter: 2017-06-30
10-Q 2017-03-31 Quarter: 2017-03-31
10-K 2016-12-31 Annual: 2016-12-31
10-Q 2016-09-30 Quarter: 2016-09-30
10-Q 2016-06-30 Quarter: 2016-06-30
10-Q 2016-03-31 Quarter: 2016-03-31
10-K 2015-12-31 Annual: 2015-12-31
10-Q 2015-09-30 Quarter: 2015-09-30
10-Q 2015-06-30 Quarter: 2015-06-30
10-Q 2015-03-31 Quarter: 2015-03-31
10-K 2014-12-31 Annual: 2014-12-31
10-Q 2014-09-30 Quarter: 2014-09-30
10-Q 2014-06-30 Quarter: 2014-06-30
10-Q 2014-03-31 Quarter: 2014-03-31
10-K 2013-12-31 Annual: 2013-12-31
8-K 2019-06-14 Enter Agreement, Exhibits
8-K 2019-06-12 Other Events, Exhibits
8-K 2019-04-23 Shareholder Vote
8-K 2019-04-18 Earnings, Regulation FD, Exhibits
8-K 2019-04-08 Officers, Exhibits
8-K 2019-02-07 Enter Agreement, Exhibits
8-K 2019-02-07 Other Events, Exhibits
8-K 2019-01-18 Earnings, Regulation FD, Exhibits
8-K 2018-12-04 Regulation FD, Exhibits
8-K 2018-11-08 Regulation FD, Exhibits
8-K 2018-11-01 Other Events, Exhibits
8-K 2018-10-30 Other Events, Exhibits
8-K 2018-10-24 Other Events, Exhibits
8-K 2018-10-19 Earnings, Regulation FD, Exhibits
8-K 2018-10-15 Amend Bylaw, Exhibits
8-K 2018-10-05 Regulation FD
8-K 2018-09-12 Regulation FD, Exhibits
8-K 2018-07-24 Other Events, Exhibits
8-K 2018-07-20 Earnings, Regulation FD, Exhibits
8-K 2018-06-28 Other Events, Exhibits
8-K 2018-06-21 Regulation FD
8-K 2018-05-15 Regulation FD, Exhibits
8-K 2018-04-24 Other Events, Exhibits
8-K 2018-04-20 Other Events, Exhibits
8-K 2018-03-06 Regulation FD, Exhibits
8-K 2018-02-13 Officers, Exhibits
8-K 2018-01-29 Other Events, Exhibits
8-K 2018-01-26 Other Events, Exhibits
8-K 2018-01-19 Earnings, Regulation FD, Exhibits
COLM Columbia Sportswear 6,610
HPP Hudson Pacific Properties 5,320
RLI RLI 3,700
HIFR Infrareit 928
EXPI EXP World 581
LIVX Livexlive Media 251
CZWI Citizens Community Bancorp 126
RBOI Results Based Outsourcing 0
CCSB Community Savings Bancorp 0
SCACU Saban Capital Acquisition 0
STI 2019-03-31
Part I - Financial Information
Item 1. Financial Statements (Unaudited)
Note 1 - Significant Accounting Policies
Note 2 - Revenue Recognition
Note 3 - Federal Funds Sold and Securities Financing Activities
Note 4 - Trading Assets and Liabilities and Derivative Instruments
Note 5 - Investment Securities
Note 6 - Loans
Note 7 - Allowance for Credit Losses
Note 8 - Goodwill and Other Intangible Assets
Note 9 - Other Assets
Note 10 - Leases
Note 11 - Certain Transfers of Financial Assets and Variable Interest Entities
Note 12 - Net Income per Common Share
Note 13 - Income Taxes
Note 14 - Employee Benefit Plans
Note 15 - Guarantees
Note 16 - Derivative Financial Instruments
Note 17 - Fair Value Election and Measurement
Note 18 - Contingencies
Note 19 - Business Segment Reporting
Note 20 - Accumulated Other Comprehensive Loss
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operation
Item 3. Quantitative and Qualitative Disclosures About Market Risk
Item 4. Controls and Procedures
Part II - Other Information
Item 1. Legal Proceedings
Item 1A. Risk Factors
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds
Item 3. Defaults Upon Senior Securities
Item 4. Mine Safety Disclosures
Item 5. Other Information
Item 6. Exhibits
EX-10.1 a33119exhibit101.htm
EX-10.2 a33119exhibit102.htm
EX-31.1 a33119exhibit311.htm
EX-31.2 a33119exhibit312.htm
EX-32.1 a33119exhibit321.htm
EX-32.2 a33119exhibit322.htm

Suntrust Banks Earnings 2019-03-31

STI 10Q Quarterly Report

Balance SheetIncome StatementCash Flow

Document
false--12-31Q120190000750556falseLarge Accelerated FilerSUNTRUST BANKS INCfalse0.980.0130000000.02500.010.220.00000.000.070.01640.0060.120.02500.010.280.00620.000.070.01740.0050.1513000000001300000000120000000000100000000.970.400.501.0033000000000.01651.000.00110.410.01080.810.01601.000.00210.370.01120.8170000004100000040590000001000000200000013000000011600000038000000240000005000000010001000P30YP20YP2YP15Y310000001.160.300.000.060.020.131.180.300.000.060.020.13Includes restricted shares of 7 thousand and 7 thousand at March 31, 2019 and December 31, 2018, respectively.Includes trading securities pledged as collateral where counterparties have the right to sell or repledge the collateral of $1,382 million and $1,442 million at March 31, 2019 and December 31, 2018, respectively.Includes noncontrolling interest of $101 million and $103 million at March 31, 2019 and December 31, 2018, respectively.Includes loans of consolidated VIEs of $147 million and $153 million at March 31, 2019 and December 31, 2018, respectively.Includes securities AFS pledged as collateral where counterparties have the right to sell or repledge the collateral of $210 million and $222 million at March 31, 2019 and December 31, 2018, respectively.Includes debt of consolidated VIEs of $156 million and $161 million at March 31, 2019 and December 31, 2018, respectively. 0000750556 2019-01-01 2019-03-31 0000750556 2019-03-31 0000750556 2019-04-30 0000750556 2018-01-01 2018-03-31 0000750556 2018-12-31 0000750556 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-03-31 0000750556 us-gaap:TreasuryStockMember 2019-03-31 0000750556 us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember 2018-12-31 0000750556 sti:TradingAssetsMember 2018-12-31 0000750556 sti:TradingAssetsMember 2019-03-31 0000750556 us-gaap:RestrictedStockMember 2019-03-31 0000750556 us-gaap:TreasuryStockMember 2018-12-31 0000750556 us-gaap:RestrictedStockMember 2018-12-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:PreferredStockMember 2018-12-31 0000750556 us-gaap:CommonStockMember 2018-03-31 0000750556 us-gaap:RetainedEarningsMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommonStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:RetainedEarningsMember 2019-01-01 2019-03-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2019-03-31 0000750556 us-gaap:RetainedEarningsMember 2017-12-31 0000750556 us-gaap:TreasuryStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:CommonStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:PreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:PreferredStockMember 2019-03-31 0000750556 us-gaap:CommonStockMember 2019-03-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 0000750556 2018-03-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-12-31 0000750556 us-gaap:TreasuryStockMember 2017-12-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2018-01-01 2018-03-31 0000750556 2017-12-31 0000750556 us-gaap:CommonStockMember 2018-12-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-03-31 0000750556 us-gaap:TreasuryStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-03-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2019-01-01 2019-03-31 0000750556 us-gaap:PreferredStockMember 2017-12-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2017-12-31 0000750556 us-gaap:CommonStockMember 2017-12-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2018-03-31 0000750556 us-gaap:TreasuryStockMember 2018-03-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2017-12-31 0000750556 us-gaap:RetainedEarningsMember 2018-03-31 0000750556 us-gaap:RetainedEarningsMember 2018-12-31 0000750556 us-gaap:AdditionalPaidInCapitalMember 2018-12-31 0000750556 us-gaap:PreferredStockMember 2018-03-31 0000750556 us-gaap:AccumulatedOtherComprehensiveIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:RetainedEarningsMember 2019-03-31 0000750556 us-gaap:SeriesAPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesFPreferredStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:SeriesHPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesHPreferredStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:SeriesGPreferredStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:SeriesAPreferredStockMember 2019-01-01 2019-03-31 0000750556 us-gaap:SeriesFPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesEPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesGPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesBPreferredStockMember 2018-01-01 2018-03-31 0000750556 us-gaap:SeriesBPreferredStockMember 2019-01-01 2019-03-31 0000750556 sti:AdoptionofASU201602Member 2019-01-01 0000750556 sti:OutofScopeofASC606Member us-gaap:MortgageBankingMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:OtherIncomeMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:CreditAndDebitCardMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:DepositAccountMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 us-gaap:FinancialServiceOtherMember 2018-01-01 2018-03-31 0000750556 sti:NetSecuritiesGainsLossesMember 2018-01-01 2018-03-31 0000750556 us-gaap:CreditAndDebitCardMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:InvestmentBankingMember 2018-01-01 2018-03-31 0000750556 us-gaap:DepositAccountMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:NetSecuritiesGainsLossesMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FiduciaryAndTrustMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:TradingMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:FiduciaryAndTrustMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CommercialRealEstateMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:OtherIncomeMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:TradingMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 us-gaap:FiduciaryAndTrustMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member 2018-01-01 2018-03-31 0000750556 us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CreditAndDebitCardMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:InvestmentBankingMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 us-gaap:MortgageBankingMember 2018-01-01 2018-03-31 0000750556 sti:InvestmentBankingMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:DepositAccountMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:FinancialServiceOtherMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:MortgageBankingMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:InvestmentBankingMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:CommercialRealEstateMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CommercialRealEstateMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialRealEstateMember 2018-01-01 2018-03-31 0000750556 us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FiduciaryAndTrustMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:TradingMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:DepositAccountMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CreditAndDebitCardMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:MortgageBankingMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:NetSecuritiesGainsLossesMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FinancialServiceOtherMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:NetSecuritiesGainsLossesMember sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member sti:TradingMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FinancialServiceOtherMember sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:CorporateOtherMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:OutofScopeofASC606Member sti:CorporateOtherMember 2018-01-01 2018-03-31 0000750556 sti:InScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:NetSecuritiesGainsLossesMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CreditAndDebitCardMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:FinancialServiceOtherMember 2019-01-01 2019-03-31 0000750556 us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:MortgageBankingMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:InvestmentBankingMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FiduciaryAndTrustMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:TradingMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 us-gaap:FiduciaryAndTrustMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:OtherIncomeMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:TradingMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FiduciaryAndTrustMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 us-gaap:FinancialServiceOtherMember 2019-01-01 2019-03-31 0000750556 us-gaap:DepositAccountMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:InvestmentBankingMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:CreditAndDebitCardMember 2019-01-01 2019-03-31 0000750556 us-gaap:CreditAndDebitCardMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:TradingMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member sti:NetSecuritiesGainsLossesMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CreditAndDebitCardMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:TradingMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:MortgageBankingMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:MortgageBankingMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:NetSecuritiesGainsLossesMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:InvestmentAdvisoryManagementAndAdministrativeServiceMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:DepositAccountMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:OtherIncomeMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CommercialRealEstateMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 us-gaap:CommercialRealEstateMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:FiduciaryAndTrustMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FinancialServiceOtherMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:InvestmentBankingMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:InvestmentBankingMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:DepositAccountMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 us-gaap:MortgageBankingMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:FinancialServiceOtherMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:CommercialRealEstateMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member sti:NetSecuritiesGainsLossesMember sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:CommercialRealEstateMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:InScopeofASC606Member us-gaap:DepositAccountMember sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 sti:OutofScopeofASC606Member us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:CorporateDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:CorporateDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:CorporateDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember 2019-03-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:Maturity30To90DaysMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:CorporateDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:CorporateDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember 2018-12-31 0000750556 us-gaap:MaturityOvernightMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:Maturity30To90DaysMember 2019-03-31 0000750556 us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:MaturityOvernightMember 2018-12-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:MaturityUpTo30DaysMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:Maturity30To90DaysMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 sti:TradingAssetsMember us-gaap:RepurchaseAgreementsMember 2019-03-31 0000750556 sti:TradingAssetsMember sti:EquityTradingMember 2019-03-31 0000750556 sti:TradingAssetsMember us-gaap:DerivativeMember 2018-12-31 0000750556 sti:TradingAssetsMember us-gaap:RepurchaseAgreementsMember 2018-12-31 0000750556 sti:TradingAssetsMember sti:EquityTradingMember 2018-12-31 0000750556 sti:TradingAssetsMember us-gaap:DerivativeMember 2019-03-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0000750556 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-03-31 0000750556 us-gaap:EquitySecuritiesMember 2018-12-31 0000750556 us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:EquitySecuritiesMember 2019-03-31 0000750556 us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:LoansMember 2018-12-31 0000750556 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:LoansMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:OtherDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember sti:TemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 sti:OtherThanTemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 us-gaap:OtherDebtSecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 us-gaap:USTreasurySecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 sti:TemporarilyImpairedSecuritiesMember 2019-03-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-01-01 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:OtherDebtSecuritiesMember 2018-01-01 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-01-01 2018-12-31 0000750556 us-gaap:OtherDebtSecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-01-01 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-01-01 2018-12-31 0000750556 2018-01-01 2018-12-31 0000750556 us-gaap:USTreasurySecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:USTreasurySecuritiesMember 2018-01-01 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-01-01 2018-12-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:USGovernmentAgenciesDebtSecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 us-gaap:USTreasurySecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 us-gaap:OtherDebtSecuritiesMember sti:TemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 sti:TemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember sti:TemporarilyImpairedSecuritiesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 sti:OtherThanTemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 us-gaap:USStatesAndPoliticalSubdivisionsMember sti:TemporarilyImpairedSecuritiesMember 2018-12-31 0000750556 sti:RecurringloanpurchaseMember us-gaap:ConsumerPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 sti:RecurringloanpurchaseMember us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 sti:NonrecurringloanpurchaseMember us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 sti:NonrecurringloanpurchaseMember us-gaap:ConsumerPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:CommercialRealEstateMember 2018-12-31 0000750556 sti:CommercialConstructionMember 2018-12-31 0000750556 us-gaap:CommercialRealEstateMember us-gaap:PassMember 2018-12-31 0000750556 sti:CommercialandIndustrialMember 2018-12-31 0000750556 sti:CommercialandIndustrialMember sti:CriticizedAccruingMember 2018-12-31 0000750556 sti:CommercialConstructionMember 2019-03-31 0000750556 sti:CommercialandIndustrialMember us-gaap:PassMember 2018-12-31 0000750556 sti:CommercialConstructionMember us-gaap:PassMember 2019-03-31 0000750556 sti:CommercialConstructionMember us-gaap:PassMember 2018-12-31 0000750556 us-gaap:CommercialRealEstateMember 2019-03-31 0000750556 us-gaap:CommercialRealEstateMember us-gaap:PassMember 2019-03-31 0000750556 sti:CommercialandIndustrialMember us-gaap:PassMember 2019-03-31 0000750556 sti:CommercialandIndustrialMember 2019-03-31 0000750556 us-gaap:CommercialRealEstateMember sti:CriticizedAccruingMember 2019-03-31 0000750556 sti:CommercialandIndustrialMember sti:CriticizedAccruingMember 2019-03-31 0000750556 sti:CommercialConstructionMember sti:CriticizedAccruingMember 2018-12-31 0000750556 us-gaap:CommercialRealEstateMember sti:CriticizedAccruingMember 2018-12-31 0000750556 sti:CommercialConstructionMember sti:CriticizedAccruingMember 2019-03-31 0000750556 sti:ResidentialConstructionMember 2019-03-31 0000750556 sti:ConsumerIndirectMember 2019-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:FederalFamilyEducationLoanProgramFfelpGuaranteedLoansMember 2019-03-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember 2019-03-31 0000750556 us-gaap:FederalNationalMortgageAssociationFnmaInsuredLoansMember 2019-03-31 0000750556 us-gaap:HomeEquityMember 2019-03-31 0000750556 us-gaap:CreditCardReceivablesMember 2019-03-31 0000750556 sti:ConsumerOtherDirectMember 2019-03-31 0000750556 us-gaap:HomeEquityMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 us-gaap:HomeEquityMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ResidentialConstructionMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 sti:ResidentialConstructionMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 us-gaap:HomeEquityMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember 2018-12-31 0000750556 us-gaap:HomeEquityMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 us-gaap:HomeEquityMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 sti:ResidentialConstructionMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 sti:ResidentialConstructionMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 us-gaap:HomeEquityMember 2018-12-31 0000750556 sti:ResidentialConstructionMember 2018-12-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ResidentialConstructionMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 us-gaap:HomeEquityMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 sti:ResidentialConstructionMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 us-gaap:CreditCardReceivablesMember 2018-12-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2018-12-31 0000750556 sti:ConsumerOtherDirectMember 2018-12-31 0000750556 sti:ConsumerIndirectMember 2018-12-31 0000750556 sti:ConsumerIndirectMember 2019-01-01 2019-03-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember 2019-01-01 2019-03-31 0000750556 us-gaap:CreditCardMember 2019-01-01 2019-03-31 0000750556 us-gaap:HomeEquityMember 2019-01-01 2019-03-31 0000750556 sti:CommercialandIndustrialMember 2019-01-01 2019-03-31 0000750556 sti:ConsumerOtherDirectMember 2019-01-01 2019-03-31 0000750556 us-gaap:FederalNationalMortgageAssociationFnmaInsuredLoansMember 2018-12-31 0000750556 us-gaap:FederalFamilyEducationLoanProgramFfelpGuaranteedLoansMember 2018-12-31 0000750556 sti:NonaccrualloansMember 2019-03-31 0000750556 sti:NonaccrualloansMember 2018-12-31 0000750556 us-gaap:FederalHomeLoanBankAdvancesMember 2019-03-31 0000750556 sti:InstallmentLoansMember 2019-03-31 0000750556 us-gaap:FederalHomeLoanBankAdvancesMember 2018-12-31 0000750556 us-gaap:FederalHomeLoanBankAdvancesMember 2019-03-31 0000750556 sti:AccrualLoansMember 2019-03-31 0000750556 us-gaap:CreditConcentrationRiskMember us-gaap:HomeEquityMember 2019-03-31 0000750556 us-gaap:FinanceLeasesPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:ResidentialPortfolioSegmentMember 2018-12-31 0000750556 us-gaap:GeographicDistributionForeignMember 2019-03-31 0000750556 us-gaap:LandAndLandImprovementsMember 2018-12-31 0000750556 us-gaap:FederalReserveBankAdvancesMember 2018-12-31 0000750556 us-gaap:CreditConcentrationRiskMember us-gaap:MortgagesMember 2018-12-31 0000750556 us-gaap:ResidentialPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:CreditConcentrationRiskMember us-gaap:HomeEquityMember 2018-12-31 0000750556 us-gaap:LandAndLandImprovementsMember 2019-03-31 0000750556 sti:AccrualLoansMember 2018-12-31 0000750556 us-gaap:CreditConcentrationRiskMember us-gaap:MortgagesMember 2019-03-31 0000750556 us-gaap:GeographicDistributionForeignMember 2018-12-31 0000750556 us-gaap:FederalHomeLoanBankAdvancesMember 2018-12-31 0000750556 sti:ProceedsduefromFHAorVAMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:CommercialPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:FederalReserveBankAdvancesMember 2019-03-31 0000750556 sti:InstallmentLoansMember 2018-12-31 0000750556 sti:ProceedsduefromFHAorVAMember 2018-12-31 0000750556 sti:ConsumerIndirectMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 sti:ConsumerIndirectMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ConsumerIndirectMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 sti:ConsumerIndirectMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 sti:ConsumerIndirectMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 sti:ConsumerIndirectMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScoreBetween620And699Member 2018-12-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScoreBetween620And699Member 2019-03-31 0000750556 sti:ConsumerOtherDirectMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScore700AndAboveMember 2018-12-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScoreBelow620Member 2018-12-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScoreBelow620Member 2019-03-31 0000750556 us-gaap:CreditCardReceivablesMember sti:FicoScore700AndAboveMember 2019-03-31 0000750556 sti:ResidentialConstructionMember 2019-01-01 2019-03-31 0000750556 sti:CommercialandIndustrialMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialRealEstateMember 2019-01-01 2019-03-31 0000750556 sti:ResidentialMortgagesNonguaranteedMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialRealEstateMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:CreditCardReceivablesMember 2019-01-01 2019-03-31 0000750556 sti:ResidentialConstructionMember 2018-01-01 2018-03-31 0000750556 us-gaap:CreditCardReceivablesMember 2018-01-01 2018-03-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:HomeEquityMember 2018-01-01 2018-03-31 0000750556 sti:ConsumerOtherDirectMember 2018-01-01 2018-03-31 0000750556 sti:ConsumerIndirectMember 2018-01-01 2018-03-31 0000750556 us-gaap:CreditCardMember 2018-01-01 2018-03-31 0000750556 us-gaap:FinanceLeasesPortfolioSegmentMember 2018-12-31 0000750556 srt:MinimumMember us-gaap:CommercialPortfolioSegmentMember 2018-12-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2017-12-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2018-03-31 0000750556 us-gaap:CommercialPortfolioSegmentMember 2018-03-31 0000750556 us-gaap:ConsumerPortfolioSegmentMember 2017-12-31 0000750556 sti:CommercialMortgageServicingRightsMember 2018-12-31 0000750556 sti:MortgageServicingRightsFairValueMember 2018-12-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2018-12-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2019-03-31 0000750556 sti:CommercialMortgageServicingRightsMember 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2018-01-01 2018-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2018-01-01 2018-12-31 0000750556 sti:MortgageServicingRightsFairValueMember 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2018-12-31 0000750556 sti:PillarFinancialMember 2018-12-31 0000750556 sti:PillarFinancialMember 2019-03-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsFairValueMember 2018-03-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2018-01-01 2018-03-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2018-03-31 0000750556 us-gaap:OtherIntangibleAssetsMember 2017-12-31 0000750556 sti:MortgageServicingRightsFairValueMember 2017-12-31 0000750556 sti:PillarFinancialMember 2019-01-01 2019-03-31 0000750556 sti:PillarFinancialMember 2018-01-01 2018-03-31 0000750556 sti:CommercialMortgageServicingRightsMember 2019-01-01 2019-03-31 0000750556 sti:CommercialMortgageServicingRightsMember 2018-01-01 2018-03-31 0000750556 sti:CommercialMortgageServicingRightsMember 2018-12-31 0000750556 sti:CommercialMortgageServicingRightsMember 2018-01-01 2018-12-31 0000750556 sti:CommercialMortgageServicingRightsMember 2019-01-01 2019-03-31 0000750556 sti:CommercialMortgageServicingRightsMember 2019-03-31 0000750556 us-gaap:EquitySecuritiesMember 2019-01-01 2019-03-31 0000750556 us-gaap:EquitySecuritiesMember 2018-01-01 2018-03-31 0000750556 sti:TaxCreditInvestmentsMember 2018-12-31 0000750556 sti:TaxCreditInvestmentsMember 2019-03-31 0000750556 us-gaap:LandAndBuildingMember 2019-03-31 0000750556 us-gaap:EquipmentMember 2019-03-31 0000750556 srt:MaximumMember sti:StructuredRealEstateMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember sti:EquipmentFinancingMember 2019-01-01 2019-03-31 0000750556 srt:MaximumMember sti:EquipmentFinancingMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember sti:StructuredRealEstateMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember 2019-03-31 0000750556 sti:EquipmentFinancingMember 2019-03-31 0000750556 srt:MaximumMember 2019-03-31 0000750556 sti:StructuredRealEstateMember 2019-03-31 0000750556 us-gaap:PropertySubjectToOperatingLeaseMember 2019-01-01 2019-03-31 0000750556 srt:MaximumMember us-gaap:LandAndBuildingMember us-gaap:PropertySubjectToOperatingLeaseMember 2019-01-01 2019-03-31 0000750556 srt:MaximumMember us-gaap:EquipmentMember us-gaap:PropertySubjectToOperatingLeaseMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember us-gaap:LandAndBuildingMember us-gaap:PropertySubjectToOperatingLeaseMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember us-gaap:EquipmentMember us-gaap:PropertySubjectToOperatingLeaseMember 2019-01-01 2019-03-31 0000750556 sti:CommercialAndCorporateLoansMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-01-01 2019-03-31 0000750556 us-gaap:LimitedPartnerMember sti:CommunityDevelopmentInvestmentsMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-12-31 0000750556 srt:MaximumMember sti:DeathDisabilityBankruptcyMember sti:StudentLoansMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-03-31 0000750556 us-gaap:LimitedPartnerMember sti:CommunityDevelopmentInvestmentsMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-03-31 0000750556 sti:StudentLoansMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000750556 sti:StudentLoansMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-03-31 0000750556 us-gaap:TotalReturnSwapMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-12-31 0000750556 sti:ManagedSecuritizedLoansMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:LimitedPartnerMember us-gaap:RenewableEnergyProgramMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-12-31 0000750556 us-gaap:TotalReturnSwapMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-03-31 0000750556 us-gaap:ResidentialMortgageMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-03-31 0000750556 sti:ManagedSecuritizedLoansMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2018-12-31 0000750556 sti:STISponsoredSecuritizationsMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:ResidentialMortgageMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-01-01 2019-03-31 0000750556 srt:MaximumMember sti:StudentLoansMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2019-03-31 0000750556 sti:STISponsoredSecuritizationsMember us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2018-12-31 0000750556 sti:CommercialAndCorporateLoansMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-03-31 0000750556 us-gaap:LimitedPartnerMember us-gaap:RenewableEnergyProgramMember us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-03-31 0000750556 us-gaap:RenewableEnergyProgramMember 2019-03-31 0000750556 sti:CommunityDevelopmentInvestmentsMember 2018-12-31 0000750556 us-gaap:RenewableEnergyProgramMember 2018-12-31 0000750556 sti:CommunityDevelopmentInvestmentsMember 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2019-01-01 2019-03-31 0000750556 us-gaap:LoansMember 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-01-01 2018-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember 2018-12-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:CommercialPortfolioSegmentMember 2018-12-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:CommercialPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:CommercialPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2018-12-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2019-03-31 0000750556 us-gaap:LoansMember 2018-12-31 0000750556 us-gaap:LoansAndFinanceReceivablesMember 2019-03-31 0000750556 us-gaap:LoansMember 2018-01-01 2018-03-31 0000750556 us-gaap:LoansAndFinanceReceivablesMember 2018-01-01 2018-03-31 0000750556 us-gaap:LoansAndFinanceReceivablesMember 2018-12-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:CommercialPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:LoansAndFinanceReceivablesMember 2019-01-01 2019-03-31 0000750556 us-gaap:LoansMember 2019-01-01 2019-03-31 0000750556 us-gaap:AssetBackedSecuritiesSecuritizedLoansAndReceivablesMember us-gaap:ConsumerPortfolioSegmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2018-01-01 2018-03-31 0000750556 us-gaap:VariableInterestEntityNotPrimaryBeneficiaryMember 2019-01-01 2019-03-31 0000750556 srt:MaximumMember sti:StudentLoansMember us-gaap:VariableInterestEntityPrimaryBeneficiaryMember 2018-12-31 0000750556 us-gaap:RestrictedStockUnitsRSUMember 2018-01-01 2018-03-31 0000750556 us-gaap:RestrictedStockUnitsRSUMember 2019-01-01 2019-03-31 0000750556 sti:WarrantsoptionsandrestrictedstockMember 2018-01-01 2018-03-31 0000750556 sti:WarrantsoptionsandrestrictedstockMember 2019-01-01 2019-03-31 0000750556 us-gaap:PensionPlansDefinedBenefitMember 2018-01-01 2018-03-31 0000750556 us-gaap:PensionPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherPostretirementBenefitPlansDefinedBenefitMember 2018-01-01 2018-03-31 0000750556 us-gaap:GuaranteeOfIndebtednessOfOthersMember 2019-03-31 0000750556 us-gaap:GuaranteeOfIndebtednessOfOthersMember 2018-12-31 0000750556 sti:VisaInterestMember 2019-03-31 0000750556 us-gaap:StandbyLettersOfCreditMember 2018-12-31 0000750556 us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember sti:VisaInterestMember us-gaap:NondesignatedMember 2009-05-01 2009-05-31 0000750556 us-gaap:StandbyLettersOfCreditMember 2019-03-31 0000750556 us-gaap:NonperformingFinancingReceivableMember sti:LoansHeldForInvestmentMember 2018-12-31 0000750556 us-gaap:PerformingFinancingReceivableMember sti:LoansHeldForInvestmentMember 2019-03-31 0000750556 us-gaap:PerformingFinancingReceivableMember sti:LoansHeldForInvestmentMember 2018-12-31 0000750556 us-gaap:NonperformingFinancingReceivableMember sti:LoansHeldForInvestmentMember 2019-03-31 0000750556 sti:VisaInterestMember 2018-12-31 0000750556 us-gaap:CreditRiskContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2018-01-01 2018-03-31 0000750556 us-gaap:NondesignatedMember 2018-01-01 2018-03-31 0000750556 us-gaap:EquityContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherContractMember us-gaap:InterestRateLockCommitmentsMember us-gaap:NondesignatedMember sti:MortgageRelatedandCommercialRealEstateRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:EquityContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2018-01-01 2018-03-31 0000750556 us-gaap:ForeignExchangeContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember sti:LoansHeldForSaleMember us-gaap:NondesignatedMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:CreditRiskContractMember sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:NondesignatedMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:CreditRiskContractMember sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember sti:MortgageServicingRightsMember us-gaap:NondesignatedMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember sti:MortgageServicingRightsMember us-gaap:NondesignatedMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2018-01-01 2018-03-31 0000750556 us-gaap:OtherContractMember us-gaap:InterestRateLockCommitmentsMember us-gaap:NondesignatedMember sti:MortgageRelatedandCommercialRealEstateRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember sti:LoansHeldForSaleMember us-gaap:NondesignatedMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:CreditRiskContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2019-01-01 2019-03-31 0000750556 us-gaap:ForeignExchangeContractMember us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:OtherTradingMember 2018-01-01 2018-03-31 0000750556 us-gaap:FairValueHedgingMember sti:BrokeredTimeDepositsMember us-gaap:NondesignatedMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember us-gaap:NondesignatedMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember us-gaap:NondesignatedMember 2019-01-01 2019-03-31 0000750556 us-gaap:FairValueHedgingMember sti:BrokeredTimeDepositsMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember 2019-01-01 2019-03-31 0000750556 us-gaap:FairValueHedgingMember sti:BrokeredTimeDepositsMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember 2019-01-01 2019-03-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember us-gaap:DesignatedAsHedgingInstrumentMember 2018-01-01 2018-12-31 0000750556 us-gaap:TotalReturnSwapMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2018-01-01 2018-12-31 0000750556 sti:CreditSupportAnnexMember 2019-03-31 0000750556 srt:MoodysBa1RatingMember sti:CreditSupportAnnexMember 2019-03-31 0000750556 srt:MaximumMember sti:AdditionalTerminationEventMember 2019-03-31 0000750556 sti:VisaInterestMember us-gaap:OtherContractMember 2019-03-31 0000750556 us-gaap:CreditRiskContractMember 2019-03-31 0000750556 us-gaap:FinancialGuaranteeMember 2019-01-01 2019-03-31 0000750556 sti:AdditionalTerminationEventMember 2019-03-31 0000750556 srt:MoodysBaa2RatingMember sti:CreditSupportAnnexMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FinancialGuaranteeMember 2019-01-01 2019-03-31 0000750556 us-gaap:EquityContractMember sti:EquityFuturesMember 2018-12-31 0000750556 sti:NettedcounterpartybalanceMember 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2018-01-01 2018-12-31 0000750556 us-gaap:FinancialGuaranteeMember 2018-01-01 2018-12-31 0000750556 sti:NettedcounterpartybalanceMember 2018-12-31 0000750556 sti:DerivativeliabilitypositionscontainingprovisionsconditionedondowngradesMember 2019-03-31 0000750556 us-gaap:TotalReturnSwapMember 2018-12-31 0000750556 sti:DerivativeliabilitypositionscontainingprovisionsconditionedondowngradesMember 2018-12-31 0000750556 srt:MoodysBaa3RatingMember sti:CreditSupportAnnexMember 2019-03-31 0000750556 us-gaap:CreditRiskContractMember 2018-12-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember sti:LoansHeldForInvestmentMember us-gaap:InterestIncomeMember 2018-01-01 2018-03-31 0000750556 sti:TradingAssetsMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FinancialGuaranteeMember 2018-01-01 2018-12-31 0000750556 us-gaap:OtherTradingMember sti:InterestratefuturesMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FinancialGuaranteeMember 2018-01-01 2018-12-31 0000750556 srt:MinimumMember us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2019-01-01 2019-03-31 0000750556 us-gaap:TradingLiabilitiesMember 2019-03-31 0000750556 sti:MortgageServicingRightsMember sti:InterestratefuturesMember 2019-03-31 0000750556 us-gaap:FinancialGuaranteeMember 2018-12-31 0000750556 sti:NettedcounterpartybalancegainsMember 2018-12-31 0000750556 sti:TradingAssetsMember 2018-12-31 0000750556 sti:NettedcounterpartybalancegainsMember 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember sti:LoansHeldForInvestmentMember us-gaap:InterestIncomeMember 2019-01-01 2019-03-31 0000750556 srt:MinimumMember us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2018-01-01 2018-12-31 0000750556 sti:LoansHeldForSaleMember sti:InterestratefuturesMember 2019-03-31 0000750556 us-gaap:TradingLiabilitiesMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember sti:InterestratefuturesMember 2018-12-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2019-01-01 2019-03-31 0000750556 us-gaap:FinancialGuaranteeMember 2019-03-31 0000750556 sti:MortgageServicingRightsMember sti:InterestratefuturesMember 2018-12-31 0000750556 us-gaap:EquityContractMember sti:EquityFuturesMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FinancialGuaranteeMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherTradingMember sti:InterestratefuturesMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:CreditRiskContractMember 2019-03-31 0000750556 us-gaap:EquityContractMember us-gaap:NondesignatedMember 2019-03-31 0000750556 us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:CreditRiskContractMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:ForeignExchangeContractMember us-gaap:NondesignatedMember 2019-03-31 0000750556 us-gaap:FixedIncomeInterestRateMember us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:CreditRiskContractMember 2018-12-31 0000750556 us-gaap:OtherContractMember us-gaap:NondesignatedMember 2018-12-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 us-gaap:EquityContractMember us-gaap:NondesignatedMember 2018-12-31 0000750556 us-gaap:FixedIncomeInterestRateMember us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:NondesignatedMember 2018-12-31 0000750556 us-gaap:ForeignExchangeContractMember us-gaap:NondesignatedMember 2018-12-31 0000750556 sti:MortgageServicingRightsMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 sti:MortgageServicingRightsMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:CommodityMember us-gaap:NondesignatedMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:CashFlowHedgingMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 us-gaap:OtherTradingMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 us-gaap:CashFlowHedgingMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:OtherContractMember us-gaap:NondesignatedMember 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 us-gaap:CommodityMember us-gaap:NondesignatedMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:FairValueHedgingMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:CashFlowHedgingMember us-gaap:InterestRateContractMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:CashFlowHedgingMember us-gaap:InterestRateContractMember 2019-03-31 0000750556 us-gaap:NondesignatedMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NondesignatedMember us-gaap:CreditRiskContractMember 2018-12-31 0000750556 us-gaap:ExchangeTradedMember 2018-12-31 0000750556 sti:DerivativesNotSubjectToMasterNettingArrangementOrSimilarArrangementMemberMember 2019-03-31 0000750556 sti:DerivativesNotSubjectToMasterNettingArrangementOrSimilarArrangementMemberMember 2018-12-31 0000750556 us-gaap:ExchangeTradedMember 2019-03-31 0000750556 sti:DerivativesSubjectToMasterNettingArrangementOrSimilarArrangementMember 2019-03-31 0000750556 sti:DerivativesSubjectToMasterNettingArrangementOrSimilarArrangementMember 2018-12-31 0000750556 us-gaap:LongTermDebtMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:LongTermDebtMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember sti:LoansHeldForInvestmentMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember sti:LoansHeldForInvestmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember us-gaap:LongTermDebtMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember 2019-01-01 2019-03-31 0000750556 us-gaap:LongTermDebtMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember 2018-01-01 2018-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:FairValueHedgingMember us-gaap:LongTermDebtMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember sti:LoansHeldForInvestmentMember 2019-01-01 2019-03-31 0000750556 us-gaap:InterestRateContractMember us-gaap:CashFlowHedgingMember sti:LoansHeldForInvestmentMember 2018-01-01 2018-03-31 0000750556 sti:VisaInterestMember us-gaap:OtherContractMember 2018-12-31 0000750556 us-gaap:InterestRateLockCommitmentsMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:NonperformingFinancingReceivableMember 2019-01-01 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:TotalReturnSwapMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:TotalReturnSwapMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:CommercialAndCorporateLeveragedLoansMember sti:TradingLoansMember 2018-12-31 0000750556 sti:DerivativecontractsnetMember 2019-01-01 2019-03-31 0000750556 sti:DerivativecontractsnetMember 2018-01-01 2018-03-31 0000750556 us-gaap:BuildingMember us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:OtherAssetsMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:SBALoansMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:SBALoansMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:InterestRateLockCommitmentsMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember 2018-01-01 2018-03-31 0000750556 sti:NonmarketableEquitySecuritiesMember us-gaap:FairValueMeasurementsNonrecurringMember us-gaap:OtherAssetsMember 2018-01-01 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:CommercialAndCorporateLeveragedLoansMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2018-12-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-01-01 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-01-01 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-01-01 2019-03-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-01-01 2018-12-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-01-01 2018-12-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueMeasurementsNonrecurringMember 2018-01-01 2018-12-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 us-gaap:OtherAssetsMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:FairValueMeasurementsNonrecurringMember 2019-03-31 0000750556 sti:OtherRealEstateOwnedMember us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsNonrecurringMember 2018-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember 2018-03-31 0000750556 us-gaap:AssetBackedSecuritiesMember 2018-01-01 2018-03-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember 2018-01-01 2018-03-31 0000750556 us-gaap:CorporateDebtSecuritiesMember 2017-12-31 0000750556 sti:LoansHeldForInvestmentMember 2017-12-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2018-03-31 0000750556 us-gaap:AssetBackedSecuritiesMember 2018-03-31 0000750556 us-gaap:CorporateDebtSecuritiesMember 2018-03-31 0000750556 us-gaap:CorporateDebtSecuritiesMember 2018-01-01 2018-03-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember 2018-03-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember 2017-12-31 0000750556 sti:DerivativecontractsnetMember 2017-12-31 0000750556 us-gaap:AssetBackedSecuritiesMember 2017-12-31 0000750556 sti:DerivativecontractsnetMember 2018-03-31 0000750556 us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember 2017-12-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-03-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:USStatesAndPoliticalSubdivisionsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USTreasurySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:EquitySecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember us-gaap:DerivativeFinancialInstrumentsAssetsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember sti:TradingLoansMember 2019-03-31 0000750556 us-gaap:FairValueConcentrationOfCreditRiskMasterNettingArrangementsMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:OtherDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:ResidentialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:DerivativeFinancialInstrumentsLiabilitiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:CommercialPaperMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:USGovernmentAgenciesDebtSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember us-gaap:CommercialMortgageBackedSecuritiesMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:LongTermDebtMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:BrokeredTimeDepositsMember 2018-01-01 2018-03-31 0000750556 us-gaap:LongTermDebtMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForSaleMember 2018-01-01 2018-03-31 0000750556 us-gaap:LongTermDebtMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:TradingLoansMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:TradingLoansMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForSaleMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:TradingLoansMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:TradingLoansMember 2018-01-01 2018-03-31 0000750556 sti:BrokeredTimeDepositsMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:MortgageServicingRightsMember us-gaap:OtherIncomeMember 2018-01-01 2018-03-31 0000750556 sti:MortgageServicingRightsMember sti:MortgageRelatedIncomeMember 2018-01-01 2018-03-31 0000750556 sti:MortgageServicingRightsMember 2018-01-01 2018-03-31 0000750556 sti:MortgageServicingRightsMember us-gaap:TradingRevenueMember 2018-01-01 2018-03-31 0000750556 sti:TradingLoansMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 sti:TradingLoansMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:LongTermDebtMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 sti:TradingLoansMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 us-gaap:LongTermDebtMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember sti:MortgageRelatedIncomeMember 2019-01-01 2019-03-31 0000750556 sti:MortgageServicingRightsMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:TradingRevenueMember 2019-01-01 2019-03-31 0000750556 us-gaap:LongTermDebtMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember 2019-01-01 2019-03-31 0000750556 sti:TradingLoansMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForSaleMember 2019-01-01 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:OtherIncomeMember 2019-01-01 2019-03-31 0000750556 us-gaap:EstimateOfFairValueFairValueDisclosureMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member 2018-12-31 0000750556 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member 2018-12-31 0000750556 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel1Member sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:CarryingReportedAmountFairValueDisclosureMember sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 sti:LoansHeldForSaleMember us-gaap:PerformingFinancingReceivableMember 2018-12-31 0000750556 sti:TradingLoansMember 2019-03-31 0000750556 sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:LongTermDebtMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NonperformingFinancingReceivableMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:NonperformingFinancingReceivableMember 2019-03-31 0000750556 sti:LoansHeldForSaleMember us-gaap:PerformingFinancingReceivableMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:PerformingFinancingReceivableMember 2018-12-31 0000750556 us-gaap:LongTermDebtMember 2018-12-31 0000750556 sti:BrokeredTimeDepositsMember 2018-12-31 0000750556 sti:TradingLoansMember 2018-12-31 0000750556 sti:LoansHeldForInvestmentMember us-gaap:PerformingFinancingReceivableMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember 2019-03-31 0000750556 sti:LoansHeldForInvestmentMember 2018-12-31 0000750556 sti:DerivativecontractsnetMember 2019-03-31 0000750556 sti:DerivativecontractsnetMember 2018-12-31 0000750556 us-gaap:FairValueInputsLevel3Member 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member 2019-03-31 0000750556 us-gaap:CarryingReportedAmountFairValueDisclosureMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member 2019-03-31 0000750556 us-gaap:EstimateOfFairValueFairValueDisclosureMember 2019-03-31 0000750556 us-gaap:EstimateOfFairValueFairValueDisclosureMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel2Member sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel3Member sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:CarryingReportedAmountFairValueDisclosureMember sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 us-gaap:FairValueInputsLevel1Member sti:BrokeredTimeDepositsMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2018-12-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:MSRValueMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputDefaultRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputCreditSpreadMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MinimumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember us-gaap:MeasurementInputPrepaymentRateMember us-gaap:IncomeApproachValuationTechniqueMember 2019-03-31 0000750556 srt:WeightedAverageMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 srt:MaximumMember us-gaap:FairValueInputsLevel3Member us-gaap:FairValueMeasurementsRecurringMember sti:PullThroughRateMember us-gaap:MarketApproachValuationTechniqueMember 2019-03-31 0000750556 us-gaap:MaterialReconcilingItemsMember 2018-01-01 2018-03-31 0000750556 sti:CorporateOtherMember 2018-01-01 2018-03-31 0000750556 sti:WholesaleMember 2018-01-01 2018-03-31 0000750556 sti:ConsumerMember 2018-01-01 2018-03-31 0000750556 us-gaap:MaterialReconcilingItemsMember 2019-01-01 2019-03-31 0000750556 sti:WholesaleMember 2019-01-01 2019-03-31 0000750556 sti:CorporateOtherMember 2019-01-01 2019-03-31 0000750556 sti:ConsumerMember 2019-01-01 2019-03-31 0000750556 us-gaap:LongTermDebtMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 0000750556 sti:DefinedBenefitPlanMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:AvailableforsaleSecuritiesMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 0000750556 sti:BrokeredTimeDepositsMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 0000750556 us-gaap:DerivativeMember us-gaap:AccumulatedOtherComprehensiveIncomeMember 2018-01-01 2018-03-31 xbrli:shares iso4217:USD xbrli:shares iso4217:USD xbrli:pure sti:contracts sti:segments