3.25.4 html 1535 994 1 true 323 0 false 8 false false R1.htm 0000001 - Document - Cover Page Sheet http://www.53.com/role/CoverPage Cover Page Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.53.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.53.com/role/CONSOLIDATEDBALANCESHEETS CONSOLIDATED BALANCE SHEETS Statements 3 false false R4.htm 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.53.com/role/CONSOLIDATEDBALANCESHEETSParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 4 false false R5.htm 9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://www.53.com/role/CONSOLIDATEDSTATEMENTSOFINCOME CONSOLIDATED STATEMENTS OF INCOME Statements 5 false false R6.htm 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.53.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 6 false false R7.htm 9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://www.53.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Statements 7 false false R8.htm 9952156 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Sheet http://www.53.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Statements 8 false false R9.htm 9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.53.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 9 false false R10.htm 9952158 - Disclosure - Summary of Significant Accounting and Reporting Policies Sheet http://www.53.com/role/SummaryofSignificantAccountingandReportingPolicies Summary of Significant Accounting and Reporting Policies Notes 10 false false R11.htm 9952159 - Disclosure - Supplemental Cash Flow Information Sheet http://www.53.com/role/SupplementalCashFlowInformation Supplemental Cash Flow Information Notes 11 false false R12.htm 9952160 - Disclosure - Restrictions on Dividends and Capital Actions Sheet http://www.53.com/role/RestrictionsonDividendsandCapitalActions Restrictions on Dividends and Capital Actions Notes 12 false false R13.htm 9952161 - Disclosure - Investment Securities Sheet http://www.53.com/role/InvestmentSecurities Investment Securities Notes 13 false false R14.htm 9952162 - Disclosure - Loans and Leases Sheet http://www.53.com/role/LoansandLeases Loans and Leases Notes 14 false false R15.htm 9952163 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLosses Credit Quality and the Allowance for Loan and Lease Losses Notes 15 false false R16.htm 9952164 - Disclosure - Bank Premises and Equipment Sheet http://www.53.com/role/BankPremisesandEquipment Bank Premises and Equipment Notes 16 false false R17.htm 9952165 - Disclosure - Operating Lease Equipment Sheet http://www.53.com/role/OperatingLeaseEquipment Operating Lease Equipment Notes 17 false false R18.htm 9952166 - Disclosure - Lease Obligations - Lessee Sheet http://www.53.com/role/LeaseObligationsLessee Lease Obligations - Lessee Notes 18 false false R19.htm 9952167 - Disclosure - Goodwill Sheet http://www.53.com/role/Goodwill Goodwill Notes 19 false false R20.htm 9952168 - Disclosure - Intangible Assets Sheet http://www.53.com/role/IntangibleAssets Intangible Assets Notes 20 false false R21.htm 9952169 - Disclosure - Variable Interest Entities Sheet http://www.53.com/role/VariableInterestEntities Variable Interest Entities Notes 21 false false R22.htm 9952170 - Disclosure - Sales of Receivables and Servicing Rights Sheet http://www.53.com/role/SalesofReceivablesandServicingRights Sales of Receivables and Servicing Rights Notes 22 false false R23.htm 9952171 - Disclosure - Derivative Financial Instruments Sheet http://www.53.com/role/DerivativeFinancialInstruments Derivative Financial Instruments Notes 23 false false R24.htm 9952172 - Disclosure - Other Assets Sheet http://www.53.com/role/OtherAssets Other Assets Notes 24 false false R25.htm 9952173 - Disclosure - Short-Term Borrowings Sheet http://www.53.com/role/ShortTermBorrowings Short-Term Borrowings Notes 25 false false R26.htm 9952174 - Disclosure - Long-Term Debt Sheet http://www.53.com/role/LongTermDebt Long-Term Debt Notes 26 false false R27.htm 9952175 - Disclosure - Commitments, Contingent Liabilities and Guarantees Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuarantees Commitments, Contingent Liabilities and Guarantees Notes 27 false false R28.htm 9952176 - Disclosure - Legal and Regulatory Proceedings Sheet http://www.53.com/role/LegalandRegulatoryProceedings Legal and Regulatory Proceedings Notes 28 false false R29.htm 9952177 - Disclosure - Related Party Transactions Sheet http://www.53.com/role/RelatedPartyTransactions Related Party Transactions Notes 29 false false R30.htm 9952178 - Disclosure - Income Taxes Sheet http://www.53.com/role/IncomeTaxes Income Taxes Notes 30 false false R31.htm 9952179 - Disclosure - Retirement and Benefit Plans Sheet http://www.53.com/role/RetirementandBenefitPlans Retirement and Benefit Plans Notes 31 false false R32.htm 9952180 - Disclosure - Accumulated Other Comprehensive Income Sheet http://www.53.com/role/AccumulatedOtherComprehensiveIncome Accumulated Other Comprehensive Income Notes 32 false false R33.htm 9952181 - Disclosure - Common, Preferred and Treasury Stock Sheet http://www.53.com/role/CommonPreferredandTreasuryStock Common, Preferred and Treasury Stock Notes 33 false false R34.htm 9952182 - Disclosure - Stock-Based Compensation Sheet http://www.53.com/role/StockBasedCompensation Stock-Based Compensation Notes 34 false false R35.htm 9952183 - Disclosure - Other Noninterest Income and Other Noninterest Expense Sheet http://www.53.com/role/OtherNoninterestIncomeandOtherNoninterestExpense Other Noninterest Income and Other Noninterest Expense Notes 35 false false R36.htm 9952184 - Disclosure - Earnings Per Share Sheet http://www.53.com/role/EarningsPerShare Earnings Per Share Notes 36 false false R37.htm 9952185 - Disclosure - Fair Value Measurements Sheet http://www.53.com/role/FairValueMeasurements Fair Value Measurements Notes 37 false false R38.htm 9952186 - Disclosure - Regulatory Capital Requirements and Capital Ratios Sheet http://www.53.com/role/RegulatoryCapitalRequirementsandCapitalRatios Regulatory Capital Requirements and Capital Ratios Notes 38 false false R39.htm 9952187 - Disclosure - Parent Company Financial Statements Sheet http://www.53.com/role/ParentCompanyFinancialStatements Parent Company Financial Statements Notes 39 false false R40.htm 9952188 - Disclosure - Business Segments Sheet http://www.53.com/role/BusinessSegments Business Segments Notes 40 false false R41.htm 9952189 - Disclosure - Business Combination Sheet http://www.53.com/role/BusinessCombination Business Combination Notes 41 false false R42.htm 9952190 - Disclosure - Subsequent Event Sheet http://www.53.com/role/SubsequentEvent Subsequent Event Notes 42 false false R43.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 43 false false R44.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 44 false false R45.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 45 false false R46.htm 9955511 - Disclosure - Summary of Significant Accounting and Reporting Policies (Policies) Sheet http://www.53.com/role/SummaryofSignificantAccountingandReportingPoliciesPolicies Summary of Significant Accounting and Reporting Policies (Policies) Policies http://www.53.com/role/SummaryofSignificantAccountingandReportingPolicies 46 false false R47.htm 9955512 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://www.53.com/role/SupplementalCashFlowInformationTables Supplemental Cash Flow Information (Tables) Tables http://www.53.com/role/SupplementalCashFlowInformation 47 false false R48.htm 9955513 - Disclosure - Investment Securities (Tables) Sheet http://www.53.com/role/InvestmentSecuritiesTables Investment Securities (Tables) Tables http://www.53.com/role/InvestmentSecurities 48 false false R49.htm 9955514 - Disclosure - Loans and Leases (Tables) Sheet http://www.53.com/role/LoansandLeasesTables Loans and Leases (Tables) Tables http://www.53.com/role/LoansandLeases 49 false false R50.htm 9955515 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses (Tables) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesTables Credit Quality and the Allowance for Loan and Lease Losses (Tables) Tables http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLosses 50 false false R51.htm 9955516 - Disclosure - Bank Premises and Equipment (Tables) Sheet http://www.53.com/role/BankPremisesandEquipmentTables Bank Premises and Equipment (Tables) Tables http://www.53.com/role/BankPremisesandEquipment 51 false false R52.htm 9955517 - Disclosure - Operating Lease Equipment (Tables) Sheet http://www.53.com/role/OperatingLeaseEquipmentTables Operating Lease Equipment (Tables) Tables http://www.53.com/role/OperatingLeaseEquipment 52 false false R53.htm 9955518 - Disclosure - Lease Obligations - Lessee (Tables) Sheet http://www.53.com/role/LeaseObligationsLesseeTables Lease Obligations - Lessee (Tables) Tables http://www.53.com/role/LeaseObligationsLessee 53 false false R54.htm 9955519 - Disclosure - Goodwill (Tables) Sheet http://www.53.com/role/GoodwillTables Goodwill (Tables) Tables http://www.53.com/role/Goodwill 54 false false R55.htm 9955520 - Disclosure - Intangible Assets (Tables) Sheet http://www.53.com/role/IntangibleAssetsTables Intangible Assets (Tables) Tables http://www.53.com/role/IntangibleAssets 55 false false R56.htm 9955521 - Disclosure - Variable Interest Entities (Tables) Sheet http://www.53.com/role/VariableInterestEntitiesTables Variable Interest Entities (Tables) Tables http://www.53.com/role/VariableInterestEntities 56 false false R57.htm 9955522 - Disclosure - Sales of Receivables and Servicing Rights (Tables) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsTables Sales of Receivables and Servicing Rights (Tables) Tables http://www.53.com/role/SalesofReceivablesandServicingRights 57 false false R58.htm 9955523 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://www.53.com/role/DerivativeFinancialInstruments 58 false false R59.htm 9955524 - Disclosure - Other Assets (Tables) Sheet http://www.53.com/role/OtherAssetsTables Other Assets (Tables) Tables http://www.53.com/role/OtherAssets 59 false false R60.htm 9955525 - Disclosure - Short-Term Borrowings (Tables) Sheet http://www.53.com/role/ShortTermBorrowingsTables Short-Term Borrowings (Tables) Tables http://www.53.com/role/ShortTermBorrowings 60 false false R61.htm 9955526 - Disclosure - Long-Term Debt (Tables) Sheet http://www.53.com/role/LongTermDebtTables Long-Term Debt (Tables) Tables http://www.53.com/role/LongTermDebt 61 false false R62.htm 9955527 - Disclosure - Commitments, Contingent Liabilities and Guarantees (Tables) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesTables Commitments, Contingent Liabilities and Guarantees (Tables) Tables http://www.53.com/role/CommitmentsContingentLiabilitiesandGuarantees 62 false false R63.htm 9955528 - Disclosure - Related Party Transactions (Tables) Sheet http://www.53.com/role/RelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://www.53.com/role/RelatedPartyTransactions 63 false false R64.htm 9955529 - Disclosure - Income Taxes (Tables) Sheet http://www.53.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.53.com/role/IncomeTaxes 64 false false R65.htm 9955530 - Disclosure - Retirement and Benefit Plans (Tables) Sheet http://www.53.com/role/RetirementandBenefitPlansTables Retirement and Benefit Plans (Tables) Tables http://www.53.com/role/RetirementandBenefitPlans 65 false false R66.htm 9955531 - Disclosure - Accumulated Other Comprehensive Income (Tables) Sheet http://www.53.com/role/AccumulatedOtherComprehensiveIncomeTables Accumulated Other Comprehensive Income (Tables) Tables http://www.53.com/role/AccumulatedOtherComprehensiveIncome 66 false false R67.htm 9955532 - Disclosure - Common, Preferred and Treasury Stock (Tables) Sheet http://www.53.com/role/CommonPreferredandTreasuryStockTables Common, Preferred and Treasury Stock (Tables) Tables http://www.53.com/role/CommonPreferredandTreasuryStock 67 false false R68.htm 9955533 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.53.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.53.com/role/StockBasedCompensation 68 false false R69.htm 9955534 - Disclosure - Other Noninterest Income and Other Noninterest Expense (Tables) Sheet http://www.53.com/role/OtherNoninterestIncomeandOtherNoninterestExpenseTables Other Noninterest Income and Other Noninterest Expense (Tables) Tables http://www.53.com/role/OtherNoninterestIncomeandOtherNoninterestExpense 69 false false R70.htm 9955535 - Disclosure - Earnings Per Share (Tables) Sheet http://www.53.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.53.com/role/EarningsPerShare 70 false false R71.htm 9955536 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.53.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.53.com/role/FairValueMeasurements 71 false false R72.htm 9955537 - Disclosure - Regulatory Capital Requirements and Capital Ratios (Tables) Sheet http://www.53.com/role/RegulatoryCapitalRequirementsandCapitalRatiosTables Regulatory Capital Requirements and Capital Ratios (Tables) Tables http://www.53.com/role/RegulatoryCapitalRequirementsandCapitalRatios 72 false false R73.htm 9955538 - Disclosure - Parent Company Financial Statements (Tables) Sheet http://www.53.com/role/ParentCompanyFinancialStatementsTables Parent Company Financial Statements (Tables) Tables http://www.53.com/role/ParentCompanyFinancialStatements 73 false false R74.htm 9955539 - Disclosure - Business Segments (Tables) Sheet http://www.53.com/role/BusinessSegmentsTables Business Segments (Tables) Tables http://www.53.com/role/BusinessSegments 74 false false R75.htm 9955540 - Disclosure - Summary of Significant Accounting and Reporting Policies - Portfolio Loans and Leases (Details) Sheet http://www.53.com/role/SummaryofSignificantAccountingandReportingPoliciesPortfolioLoansandLeasesDetails Summary of Significant Accounting and Reporting Policies - Portfolio Loans and Leases (Details) Details 75 false false R76.htm 9955541 - Disclosure - Summary of Significant Accounting and Reporting Policies - ALLL (Details) Sheet http://www.53.com/role/SummaryofSignificantAccountingandReportingPoliciesALLLDetails Summary of Significant Accounting and Reporting Policies - ALLL (Details) Details http://www.53.com/role/SummaryofSignificantAccountingandReportingPoliciesPolicies 76 false false R77.htm 9955542 - Disclosure - Summary of Significant Accounting and Reporting Policies - Pension Plans (Details) Sheet http://www.53.com/role/SummaryofSignificantAccountingandReportingPoliciesPensionPlansDetails Summary of Significant Accounting and Reporting Policies - Pension Plans (Details) Details 77 false false R78.htm 9955543 - Disclosure - Supplemental Cash Flow Information (Details) Sheet http://www.53.com/role/SupplementalCashFlowInformationDetails Supplemental Cash Flow Information (Details) Details http://www.53.com/role/SupplementalCashFlowInformationTables 78 false false R79.htm 9955544 - Disclosure - Restrictions on Dividends and Capital Actions (Details) Sheet http://www.53.com/role/RestrictionsonDividendsandCapitalActionsDetails Restrictions on Dividends and Capital Actions (Details) Details http://www.53.com/role/RestrictionsonDividendsandCapitalActions 79 false false R80.htm 9955545 - Disclosure - Investment Securities - Investment Securities (Details) Sheet http://www.53.com/role/InvestmentSecuritiesInvestmentSecuritiesDetails Investment Securities - Investment Securities (Details) Details 80 false false R81.htm 9955546 - Disclosure - Investment Securities - Additional Information (Details) Sheet http://www.53.com/role/InvestmentSecuritiesAdditionalInformationDetails Investment Securities - Additional Information (Details) Details 81 false false R82.htm 9955547 - Disclosure - Investment Securities - Gains and Losses Recognized in Income from Securities (Details) Sheet http://www.53.com/role/InvestmentSecuritiesGainsandLossesRecognizedinIncomefromSecuritiesDetails Investment Securities - Gains and Losses Recognized in Income from Securities (Details) Details 82 false false R83.htm 9955548 - Disclosure - Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt and Held-to-Maturity Securities (Details) Sheet http://www.53.com/role/InvestmentSecuritiesAmortizedCostandFairValueofAvailableforSaleDebtandHeldtoMaturitySecuritiesDetails Investment Securities - Amortized Cost and Fair Value of Available-for-Sale Debt and Held-to-Maturity Securities (Details) Details 83 false false R84.htm 9955549 - Disclosure - Investment Securities - Fair Value and Gross Unrealized Losses on Available-for-Sale Debt Securities (Details) Sheet http://www.53.com/role/InvestmentSecuritiesFairValueandGrossUnrealizedLossesonAvailableforSaleDebtSecuritiesDetails Investment Securities - Fair Value and Gross Unrealized Losses on Available-for-Sale Debt Securities (Details) Details 84 false false R85.htm 9955550 - Disclosure - Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) Sheet http://www.53.com/role/LoansandLeasesLoansandLeasesClassifiedbyPrimaryPurposeDetails Loans and Leases - Loans and Leases Classified by Primary Purpose (Details) Details 85 false false R86.htm 9955551 - Disclosure - Loans and Leases - Additional Information (Details) Sheet http://www.53.com/role/LoansandLeasesAdditionalInformationDetails Loans and Leases - Additional Information (Details) Details 86 false false R87.htm 9955552 - Disclosure - Loans and Leases - Total Net Charge-Offs (Recoveries) (Details) Sheet http://www.53.com/role/LoansandLeasesTotalNetChargeOffsRecoveriesDetails Loans and Leases - Total Net Charge-Offs (Recoveries) (Details) Details 87 false false R88.htm 9955553 - Disclosure - Loans and Leases - Components of Net Investment in Leases (Details) Sheet http://www.53.com/role/LoansandLeasesComponentsofNetInvestmentinLeasesDetails Loans and Leases - Components of Net Investment in Leases (Details) Details 88 false false R89.htm 9955554 - Disclosure - Loans and Leases - Undiscounted Cash Flows (Details) Sheet http://www.53.com/role/LoansandLeasesUndiscountedCashFlowsDetails Loans and Leases - Undiscounted Cash Flows (Details) Details 89 false false R90.htm 9955555 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Transactions in the ALLL by Portfolio Segment (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofTransactionsintheALLLbyPortfolioSegmentDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Transactions in the ALLL by Portfolio Segment (Details) Details 90 false false R91.htm 9955556 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryoftheALLLandRelatedLoansandLeasesClassifiedbyPortfolioSegmentDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Details) Details 91 false false R92.htm 9955557 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryoftheCreditRiskProfileoftheBancorpsCommercialPortfolioSegmentbyClassDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class (Details) Details 92 false false R93.htm 9955558 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Gross Charge-Offs Within the Commercial Portfolio Segments, by Class and Vintage (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofGrossChargeOffsWithintheCommercialPortfolioSegmentsbyClassandVintageDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Gross Charge-Offs Within the Commercial Portfolio Segments, by Class and Vintage (Details) Details 93 false false R94.htm 9955559 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Recorded Investment in Portfolio Loans and Leases by Age and Class (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofRecordedInvestmentinPortfolioLoansandLeasesbyAgeandClassDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Recorded Investment in Portfolio Loans and Leases by Age and Class (Details) Details 94 false false R95.htm 9955560 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryoftheCreditRiskProfileoftheBancorpsResidentialMortgageandConsumerPortfolioSegmentsbyClassDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Credit Risk Profile of the Bancorp's Residential Mortgage and Consumer Portfolio Segments by Class (Details) Details 95 false false R96.htm 9955561 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Gross Charge-Offs Within the Residential Mortgage and Consumer Portfolio Segments, by Class and Vintage (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofGrossChargeOffsWithintheResidentialMortgageandConsumerPortfolioSegmentsbyClassandVintageDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Gross Charge-Offs Within the Residential Mortgage and Consumer Portfolio Segments, by Class and Vintage (Details) Details 96 false false R97.htm 9955562 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Amortized Cost Basis of the Bancorp's Collateral Dependent Loans (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryoftheAmortizedCostBasisoftheBancorpsCollateralDependentLoansDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Amortized Cost Basis of the Bancorp's Collateral Dependent Loans (Details) Details 97 false false R98.htm 9955563 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Bancorp's Nonaccrual Loans and Leases by Class (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryoftheBancorpsNonaccrualLoansandLeasesbyClassDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of the Bancorp's Nonaccrual Loans and Leases by Class (Details) Details 98 false false R99.htm 9955564 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesAdditionalInformationDetails Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details) Details 99 false false R100.htm 9955565 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Loans Modified for Borrowers Experiencing Financial Difficulty (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofAmortizedCostBasisofLoansModifiedforBorrowersExperiencingFinancialDifficultyDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Loans Modified for Borrowers Experiencing Financial Difficulty (Details) Details 100 false false R101.htm 9955566 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Financial Impacts of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofFinancialImpactsofLoansThatWereModifiedforBorrowersExperiencingFinancialDifficultyDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Financial Impacts of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) Details 101 false false R102.htm 9955567 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofLoansThatWereModifiedforBorrowersExperiencingFinancialDifficultyDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) Details 102 false false R103.htm 9955568 - Disclosure - Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Modifications to Borrowers Experiencing Financial Difficulty (Details) Sheet http://www.53.com/role/CreditQualityandtheAllowanceforLoanandLeaseLossesSummaryofAmortizedCostBasisofModificationstoBorrowersExperiencingFinancialDifficultyDetails Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Modifications to Borrowers Experiencing Financial Difficulty (Details) Details 103 false false R104.htm 9955569 - Disclosure - Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) Sheet http://www.53.com/role/BankPremisesandEquipmentSummaryofBankPremisesandEquipmentDetails Bank Premises and Equipment - Summary of Bank Premises and Equipment (Details) Details 104 false false R105.htm 9955570 - Disclosure - Bank Premises and Equipment - Additional Information (Details) Sheet http://www.53.com/role/BankPremisesandEquipmentAdditionalInformationDetails Bank Premises and Equipment - Additional Information (Details) Details 105 false false R106.htm 9955571 - Disclosure - Operating Lease Equipment - Additional Information (Details) Sheet http://www.53.com/role/OperatingLeaseEquipmentAdditionalInformationDetails Operating Lease Equipment - Additional Information (Details) Details 106 false false R107.htm 9955572 - Disclosure - Operating Lease Equipment - Future Lease Payments Receivable (Details) Sheet http://www.53.com/role/OperatingLeaseEquipmentFutureLeasePaymentsReceivableDetails Operating Lease Equipment - Future Lease Payments Receivable (Details) Details 107 false false R108.htm 9955573 - Disclosure - Lease Obligations - Lessee - Lease Assets and Lease Liabilities (Details) Sheet http://www.53.com/role/LeaseObligationsLesseeLeaseAssetsandLeaseLiabilitiesDetails Lease Obligations - Lessee - Lease Assets and Lease Liabilities (Details) Details 108 false false R109.htm 9955574 - Disclosure - Lease Obligations - Lessee - Lease Costs (Details) Sheet http://www.53.com/role/LeaseObligationsLesseeLeaseCostsDetails Lease Obligations - Lessee - Lease Costs (Details) Details 109 false false R110.htm 9955575 - Disclosure - Lease Obligations - Lessee - Undiscounted Cash Flows (Details) Sheet http://www.53.com/role/LeaseObligationsLesseeUndiscountedCashFlowsDetails Lease Obligations - Lessee - Undiscounted Cash Flows (Details) Details 110 false false R111.htm 9955576 - Disclosure - Lease Obligations - Lessee - Other Information (Details) Sheet http://www.53.com/role/LeaseObligationsLesseeOtherInformationDetails Lease Obligations - Lessee - Other Information (Details) Details 111 false false R112.htm 9955577 - Disclosure - Goodwill (Details) Sheet http://www.53.com/role/GoodwillDetails Goodwill (Details) Details http://www.53.com/role/GoodwillTables 112 false false R113.htm 9955578 - Disclosure - Intangible Assets - Schedule of Intangible Assets (Details) Sheet http://www.53.com/role/IntangibleAssetsScheduleofIntangibleAssetsDetails Intangible Assets - Schedule of Intangible Assets (Details) Details 113 false false R114.htm 9955579 - Disclosure - Intangible Assets - Additional Information (Details) Sheet http://www.53.com/role/IntangibleAssetsAdditionalInformationDetails Intangible Assets - Additional Information (Details) Details 114 false false R115.htm 9955580 - Disclosure - Intangible Assets - Estimated Amortization Expense (Details) Sheet http://www.53.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails Intangible Assets - Estimated Amortization Expense (Details) Details 115 false false R116.htm 9955581 - Disclosure - Variable Interest Entities - Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Details) Sheet http://www.53.com/role/VariableInterestEntitiesClassificationsofConsolidatedVIEAssetsLiabilitiesandNoncontrollingInterestIncludedintheBancorpsConsolidatedBalanceSheetsDetails Variable Interest Entities - Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Details) Details 116 false false R117.htm 9955582 - Disclosure - Variable Interest Entities - Additional Information (Details) Sheet http://www.53.com/role/VariableInterestEntitiesAdditionalInformationDetails Variable Interest Entities - Additional Information (Details) Details 117 false false R118.htm 9955583 - Disclosure - Variable Interest Entities - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) Sheet http://www.53.com/role/VariableInterestEntitiesAssetsandLiabilitiesRelatedtoNonconsolidatedVIEsandMaximumExposuretoLossesDetails Variable Interest Entities - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) Details 118 false false R119.htm 9955584 - Disclosure - Variable Interest Entities - Investments in Qualified Affordable Housing Tax Credits (Details) Sheet http://www.53.com/role/VariableInterestEntitiesInvestmentsinQualifiedAffordableHousingTaxCreditsDetails Variable Interest Entities - Investments in Qualified Affordable Housing Tax Credits (Details) Details 119 false false R120.htm 9955585 - Disclosure - Sales of Receivables and Servicing Rights - Activity Related to Mortgage Banking Net Revenue (Details) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsActivityRelatedtoMortgageBankingNetRevenueDetails Sales of Receivables and Servicing Rights - Activity Related to Mortgage Banking Net Revenue (Details) Details 120 false false R121.htm 9955586 - Disclosure - Sales of Receivables and Servicing Rights - Changes in the Servicing Assets (Details) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsChangesintheServicingAssetsDetails Sales of Receivables and Servicing Rights - Changes in the Servicing Assets (Details) Details 121 false false R122.htm 9955587 - Disclosure - Sales of Receivables and Servicing Rights - Servicing Rights and Residual Interests Economic Assumptions (Details) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsServicingRightsandResidualInterestsEconomicAssumptionsDetails Sales of Receivables and Servicing Rights - Servicing Rights and Residual Interests Economic Assumptions (Details) Details 122 false false R123.htm 9955588 - Disclosure - Sales of Receivables and Servicing Rights - Additional Information (Details) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsAdditionalInformationDetails Sales of Receivables and Servicing Rights - Additional Information (Details) Details 123 false false R124.htm 9955589 - Disclosure - Sales of Receivables and Servicing Rights - Sensitivity of the Current Fair Value of Residual Cash Flows to Immediate 10%, 20% and 50% Adverse Changes in Assumptions (Details) Sheet http://www.53.com/role/SalesofReceivablesandServicingRightsSensitivityoftheCurrentFairValueofResidualCashFlowstoImmediate1020and50AdverseChangesinAssumptionsDetails Sales of Receivables and Servicing Rights - Sensitivity of the Current Fair Value of Residual Cash Flows to Immediate 10%, 20% and 50% Adverse Changes in Assumptions (Details) Details 124 false false R125.htm 9955590 - Disclosure - Derivative Financial Instruments - Additional Information (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsAdditionalInformationDetails Derivative Financial Instruments - Additional Information (Details) Details 125 false false R126.htm 9955591 - Disclosure - Derivative Financial Instruments - Notional Amounts and Fair Values for All Derivative Instruments Included in the Condensed Consolidated Balance Sheets (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsNotionalAmountsandFairValuesforAllDerivativeInstrumentsIncludedintheCondensedConsolidatedBalanceSheetsDetails Derivative Financial Instruments - Notional Amounts and Fair Values for All Derivative Instruments Included in the Condensed Consolidated Balance Sheets (Details) Details 126 false false R127.htm 9955592 - Disclosure - Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsChangeintheFairValueforInterestRateContractsandtheRelatedHedgedItemsDetails Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) Details 127 false false R128.htm 9955593 - Disclosure - Derivative Financial Instruments - Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsNetGainsLossesRelatingtoDerivativeInstrumentsDesignatedasCashFlowHedgesDetails Derivative Financial Instruments - Net Gains (Losses) Relating to Derivative Instruments Designated as Cash Flow Hedges (Details) Details 128 false false R129.htm 9955594 - Disclosure - Derivative Financial Instruments - Net Gains (Losses) Recorded in the Condensed Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsNetGainsLossesRecordedintheCondensedConsolidatedStatementsofIncomeRelatingtoFreeStandingDerivativeInstrumentsUsedforRiskManagementandOtherBusinessPurposesDetails Derivative Financial Instruments - Net Gains (Losses) Recorded in the Condensed Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used for Risk Management and Other Business Purposes (Details) Details 129 false false R130.htm 9955595 - Disclosure - Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsRiskRatingsoftheNotionalAmountofRiskParticipationAgreementsDetails Derivative Financial Instruments - Risk Ratings of the Notional Amount of Risk Participation Agreements (Details) Details 130 false false R131.htm 9955596 - Disclosure - Derivative Financial Instruments - Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Customer Accommodation (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsNetGainsLossesRecordedintheConsolidatedStatementsofIncomeRelatingtoFreeStandingDerivativeInstrumentsUsedForCustomerAccommodationDetails Derivative Financial Instruments - Net Gains (Losses) Recorded in the Consolidated Statements of Income Relating to Free-Standing Derivative Instruments Used For Customer Accommodation (Details) Details 131 false false R132.htm 9955597 - Disclosure - Derivative Financial Instruments - Offsetting Derivative Financial Instruments (Details) Sheet http://www.53.com/role/DerivativeFinancialInstrumentsOffsettingDerivativeFinancialInstrumentsDetails Derivative Financial Instruments - Offsetting Derivative Financial Instruments (Details) Details 132 false false R133.htm 9955598 - Disclosure - Other Assets - Components (Details) Sheet http://www.53.com/role/OtherAssetsComponentsDetails Other Assets - Components (Details) Details 133 false false R134.htm 9955599 - Disclosure - Short-Term Borrowings - Summary of Short-Term Borrowings and Weighted-Average Rates (Details) Sheet http://www.53.com/role/ShortTermBorrowingsSummaryofShortTermBorrowingsandWeightedAverageRatesDetails Short-Term Borrowings - Summary of Short-Term Borrowings and Weighted-Average Rates (Details) Details 134 false false R135.htm 9955600 - Disclosure - Short-Term Borrowings - Components of Other Short-Term Borrowings (Details) Sheet http://www.53.com/role/ShortTermBorrowingsComponentsofOtherShortTermBorrowingsDetails Short-Term Borrowings - Components of Other Short-Term Borrowings (Details) Details 135 false false R136.htm 9955601 - Disclosure - Long-Term Debt - Summary of the Bancorp's Long-Term Borrowings (Details) Sheet http://www.53.com/role/LongTermDebtSummaryoftheBancorpsLongTermBorrowingsDetails Long-Term Debt - Summary of the Bancorp's Long-Term Borrowings (Details) Details 136 false false R137.htm 9955602 - Disclosure - Long-Term Debt - Schedule of Aggregate Maturities of Long-Term Debt Obligations (Details) Sheet http://www.53.com/role/LongTermDebtScheduleofAggregateMaturitiesofLongTermDebtObligationsDetails Long-Term Debt - Schedule of Aggregate Maturities of Long-Term Debt Obligations (Details) Details 137 false false R138.htm 9955603 - Disclosure - Long-Term Debt - Additional Information (Details) Sheet http://www.53.com/role/LongTermDebtAdditionalInformationDetails Long-Term Debt - Additional Information (Details) Details 138 false false R139.htm 9955604 - Disclosure - Long-Term Debt - Senior Notes (Details) Notes http://www.53.com/role/LongTermDebtSeniorNotesDetails Long-Term Debt - Senior Notes (Details) Details 139 false false R140.htm 9955605 - Disclosure - Long-Term Debt - Subordinated Debt (Details) Sheet http://www.53.com/role/LongTermDebtSubordinatedDebtDetails Long-Term Debt - Subordinated Debt (Details) Details 140 false false R141.htm 9955606 - Disclosure - Long-Term Debt - Senior and Subordinated Debt (Details) Sheet http://www.53.com/role/LongTermDebtSeniorandSubordinatedDebtDetails Long-Term Debt - Senior and Subordinated Debt (Details) Details 141 false false R142.htm 9955607 - Disclosure - Long-Term Debt - Junior Subordinated Debt (Details) Sheet http://www.53.com/role/LongTermDebtJuniorSubordinatedDebtDetails Long-Term Debt - Junior Subordinated Debt (Details) Details 142 false false R143.htm 9955608 - Disclosure - Long-Term Debt - FHLB Advances (Details) Sheet http://www.53.com/role/LongTermDebtFHLBAdvancesDetails Long-Term Debt - FHLB Advances (Details) Details 143 false false R144.htm 9955609 - Disclosure - Long-Term Debt - Notes Associated with Consolidated VIEs (Details) Notes http://www.53.com/role/LongTermDebtNotesAssociatedwithConsolidatedVIEsDetails Long-Term Debt - Notes Associated with Consolidated VIEs (Details) Details 144 false false R145.htm 9955610 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesSummaryofSignificantCommitmentsDetails Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) Details 145 false false R146.htm 9955611 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Additional Information (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesAdditionalInformationDetails Commitments, Contingent Liabilities and Guarantees - Additional Information (Details) Details 146 false false R147.htm 9955612 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Risk Rating Under the Risk Rating System (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesRiskRatingUndertheRiskRatingSystemDetails Commitments, Contingent Liabilities and Guarantees - Risk Rating Under the Risk Rating System (Details) Details 147 false false R148.htm 9955613 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Standby and Commercial Letters of Credit, Conditional Commitments Issued to Guarantee the Performance of a Customer to a Third Party (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesStandbyandCommercialLettersofCreditConditionalCommitmentsIssuedtoGuaranteethePerformanceofaCustomertoaThirdPartyDetails Commitments, Contingent Liabilities and Guarantees - Standby and Commercial Letters of Credit, Conditional Commitments Issued to Guarantee the Performance of a Customer to a Third Party (Details) Details 148 false false R149.htm 9955614 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Letters of Credit (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesLettersofCreditDetails Commitments, Contingent Liabilities and Guarantees - Letters of Credit (Details) Details 149 false false R150.htm 9955615 - Disclosure - Commitments, Contingent Liabilities and Guarantees - Visa Funding and Bancorp Cash Payments (Details) Sheet http://www.53.com/role/CommitmentsContingentLiabilitiesandGuaranteesVisaFundingandBancorpCashPaymentsDetails Commitments, Contingent Liabilities and Guarantees - Visa Funding and Bancorp Cash Payments (Details) Details 150 false false R151.htm 9955616 - Disclosure - Legal and Regulatory Proceedings (Details) Sheet http://www.53.com/role/LegalandRegulatoryProceedingsDetails Legal and Regulatory Proceedings (Details) Details http://www.53.com/role/LegalandRegulatoryProceedings 151 false false R152.htm 9955617 - Disclosure - Related Party Transactions - Summary of the Bancorp's Activities with its Principal Shareholders, Directors and Executives (Details) Sheet http://www.53.com/role/RelatedPartyTransactionsSummaryoftheBancorpsActivitieswithitsPrincipalShareholdersDirectorsandExecutivesDetails Related Party Transactions - Summary of the Bancorp's Activities with its Principal Shareholders, Directors and Executives (Details) Details 152 false false R153.htm 9955618 - Disclosure - Income Taxes - Summary of income before income taxes (Details) Sheet http://www.53.com/role/IncomeTaxesSummaryofincomebeforeincometaxesDetails Income Taxes - Summary of income before income taxes (Details) Details 153 false false R154.htm 9955619 - Disclosure - Income Taxes - Applicable Income Taxes Included in the Consolidated Statements of Income (Details) Sheet http://www.53.com/role/IncomeTaxesApplicableIncomeTaxesIncludedintheConsolidatedStatementsofIncomeDetails Income Taxes - Applicable Income Taxes Included in the Consolidated Statements of Income (Details) Details 154 false false R155.htm 9955620 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://www.53.com/role/IncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 155 false false R156.htm 9955621 - Disclosure - Income Taxes - Reconciliation Between the Federal Statutory Corporate Tax Rate and the Bancorp's Effective Tax Rate (Details) Sheet http://www.53.com/role/IncomeTaxesReconciliationBetweentheFederalStatutoryCorporateTaxRateandtheBancorpsEffectiveTaxRateDetails Income Taxes - Reconciliation Between the Federal Statutory Corporate Tax Rate and the Bancorp's Effective Tax Rate (Details) Details 156 false false R157.htm 9955622 - Disclosure - Income Taxes - Summary of Income Taxes Paid, Net (Details) Sheet http://www.53.com/role/IncomeTaxesSummaryofIncomeTaxesPaidNetDetails Income Taxes - Summary of Income Taxes Paid, Net (Details) Details 157 false false R158.htm 9955623 - Disclosure - Income Taxes - Reconciliation of the Beginning and Ending Amounts of the Bancorp's Unrecognized Tax Benefits (Details) Sheet http://www.53.com/role/IncomeTaxesReconciliationoftheBeginningandEndingAmountsoftheBancorpsUnrecognizedTaxBenefitsDetails Income Taxes - Reconciliation of the Beginning and Ending Amounts of the Bancorp's Unrecognized Tax Benefits (Details) Details 158 false false R159.htm 9955624 - Disclosure - Income Taxes - Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets (Details) Sheet http://www.53.com/role/IncomeTaxesDeferredIncomeTaxesIncludedinOtherAssetsintheConsolidatedBalanceSheetsDetails Income Taxes - Deferred Income Taxes Included in Other Assets in the Consolidated Balance Sheets (Details) Details 159 false false R160.htm 9955625 - Disclosure - Retirement and Benefit Plans - Defined Benefit Retirement Plans with Overfunded and Underfunded Status (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansDefinedBenefitRetirementPlanswithOverfundedandUnderfundedStatusDetails Retirement and Benefit Plans - Defined Benefit Retirement Plans with Overfunded and Underfunded Status (Details) Details 160 false false R161.htm 9955626 - Disclosure - Retirement and Benefit Plans - Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansNetPeriodicBenefitCostandOtherChangesinPlanAssetsandBenefitObligationsRecognizedinOtherComprehensiveIncomeDetails Retirement and Benefit Plans - Net Periodic Benefit Cost and Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) Details 161 false false R162.htm 9955627 - Disclosure - Retirement and Benefit Plans - Plan Assets Measured at Fair Value on a Recurring Basis (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansPlanAssetsMeasuredatFairValueonaRecurringBasisDetails Retirement and Benefit Plans - Plan Assets Measured at Fair Value on a Recurring Basis (Details) Details 162 false false R163.htm 9955628 - Disclosure - Retirement and Benefit Plans - Plan Assumptions (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansPlanAssumptionsDetails Retirement and Benefit Plans - Plan Assumptions (Details) Details 163 false false R164.htm 9955629 - Disclosure - Retirement and Benefit Plans - Additional Information (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansAdditionalInformationDetails Retirement and Benefit Plans - Additional Information (Details) Details 164 false false R165.htm 9955630 - Disclosure - Retirement and Benefit Plans - Targeted and Actual Weighted Average Asset Allocations by Plan Asset Category (Details) Sheet http://www.53.com/role/RetirementandBenefitPlansTargetedandActualWeightedAverageAssetAllocationsbyPlanAssetCategoryDetails Retirement and Benefit Plans - Targeted and Actual Weighted Average Asset Allocations by Plan Asset Category (Details) Details 165 false false R166.htm 9955631 - Disclosure - Accumulated Other Comprehensive Income - Activity in AOCI (Details) Sheet http://www.53.com/role/AccumulatedOtherComprehensiveIncomeActivityinAOCIDetails Accumulated Other Comprehensive Income - Activity in AOCI (Details) Details 166 false false R167.htm 9955632 - Disclosure - Accumulated Other Comprehensive Income - Reclassification Out of AOCI (Details) Sheet http://www.53.com/role/AccumulatedOtherComprehensiveIncomeReclassificationOutofAOCIDetails Accumulated Other Comprehensive Income - Reclassification Out of AOCI (Details) Details 167 false false R168.htm 9955633 - Disclosure - Common, Preferred and Treasury Stock - Share Activity within Common, Preferred and Treasury Stock (Details) Sheet http://www.53.com/role/CommonPreferredandTreasuryStockShareActivitywithinCommonPreferredandTreasuryStockDetails Common, Preferred and Treasury Stock - Share Activity within Common, Preferred and Treasury Stock (Details) Details 168 false false R169.htm 9955634 - Disclosure - Common, Preferred and Treasury Stock - Additional Information (Details) Sheet http://www.53.com/role/CommonPreferredandTreasuryStockAdditionalInformationDetails Common, Preferred and Treasury Stock - Additional Information (Details) Details 169 false false R170.htm 9955635 - Disclosure - Common, Preferred and Treasury Stock - Treasury Stock (Details) Sheet http://www.53.com/role/CommonPreferredandTreasuryStockTreasuryStockDetails Common, Preferred and Treasury Stock - Treasury Stock (Details) Details 170 false false R171.htm 9955636 - Disclosure - Stock-Based Compensation - Additional Information (Details) Sheet http://www.53.com/role/StockBasedCompensationAdditionalInformationDetails Stock-Based Compensation - Additional Information (Details) Details 171 false false R172.htm 9955637 - Disclosure - Stock-Based Compensation - Schedule of Share-based Payment, Award, Stock Appreciation Rights, Valuation Assumptions (Details) Sheet http://www.53.com/role/StockBasedCompensationScheduleofSharebasedPaymentAwardStockAppreciationRightsValuationAssumptionsDetails Stock-Based Compensation - Schedule of Share-based Payment, Award, Stock Appreciation Rights, Valuation Assumptions (Details) Details 172 false false R173.htm 9955638 - Disclosure - Stock-Based Compensation - Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity (Details) Sheet http://www.53.com/role/StockBasedCompensationScheduleofSharebasedCompensationStockAppreciationRightsAwardActivityDetails Stock-Based Compensation - Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity (Details) Details 173 false false R174.htm 9955639 - Disclosure - Stock-Based Compensation - Outstanding and Exercisable SARs by Grant Price (Details) Sheet http://www.53.com/role/StockBasedCompensationOutstandingandExercisableSARsbyGrantPriceDetails Stock-Based Compensation - Outstanding and Exercisable SARs by Grant Price (Details) Details 174 false false R175.htm 9955640 - Disclosure - Stock-Based Compensation - Schedule of Share-based Compensation, Restricted Stock Units Activity (Details) Sheet http://www.53.com/role/StockBasedCompensationScheduleofSharebasedCompensationRestrictedStockUnitsActivityDetails Stock-Based Compensation - Schedule of Share-based Compensation, Restricted Stock Units Activity (Details) Details 175 false false R176.htm 9955641 - Disclosure - Stock-Based Compensation - Outstanding RSUs by Grant-Date Fair Value (Details) Sheet http://www.53.com/role/StockBasedCompensationOutstandingRSUsbyGrantDateFairValueDetails Stock-Based Compensation - Outstanding RSUs by Grant-Date Fair Value (Details) Details 176 false false R177.htm 9955642 - Disclosure - Stock-Based Compensation - Schedule of Share-based Compensation, Stock Options, Activity (Details) Sheet http://www.53.com/role/StockBasedCompensationScheduleofSharebasedCompensationStockOptionsActivityDetails Stock-Based Compensation - Schedule of Share-based Compensation, Stock Options, Activity (Details) Details 177 false false R178.htm 9955643 - Disclosure - Stock-Based Compensation - Schedule of Outstanding And Exercisable Stock Options Exercise Price (Details) Sheet http://www.53.com/role/StockBasedCompensationScheduleofOutstandingAndExercisableStockOptionsExercisePriceDetails Stock-Based Compensation - Schedule of Outstanding And Exercisable Stock Options Exercise Price (Details) Details 178 false false R179.htm 9955644 - Disclosure - Other Noninterest Income and Other Noninterest Expense (Details) Sheet http://www.53.com/role/OtherNoninterestIncomeandOtherNoninterestExpenseDetails Other Noninterest Income and Other Noninterest Expense (Details) Details http://www.53.com/role/OtherNoninterestIncomeandOtherNoninterestExpenseTables 179 false false R180.htm 9955645 - Disclosure - Earnings Per Share - Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Details) Sheet http://www.53.com/role/EarningsPerShareCalculationofEarningsPerShareandtheReconciliationofEarningsPerSharetoEarningsPerDilutedShareDetails Earnings Per Share - Calculation of Earnings Per Share and the Reconciliation of Earnings Per Share to Earnings Per Diluted Share (Details) Details 180 false false R181.htm 9955646 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Sheet http://www.53.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Details 181 false false R182.htm 9955647 - Disclosure - Fair Value Measurements - Additional Information (Details) Sheet http://www.53.com/role/FairValueMeasurementsAdditionalInformationDetails Fair Value Measurements - Additional Information (Details) Details 182 false false R183.htm 9955648 - Disclosure - Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) Sheet http://www.53.com/role/FairValueMeasurementsReconciliationofAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisUsingSignificantUnobservableInputsDetails Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) Details 183 false false R184.htm 9955649 - Disclosure - Fair Value Measurements - Total Gains and Losses Included in Earnings for Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) Sheet http://www.53.com/role/FairValueMeasurementsTotalGainsandLossesIncludedinEarningsforAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisUsingSignificantUnobservableInputsDetails Fair Value Measurements - Total Gains and Losses Included in Earnings for Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) Details 184 false false R185.htm 9955650 - Disclosure - Fair Value Measurements - Total Gains and Losses Included in Earning Attributable to Changes in Unrealized Gains and Losses Related to Level 3 Assets and Liabilities Still Held at Year End (Details) Sheet http://www.53.com/role/FairValueMeasurementsTotalGainsandLossesIncludedinEarningAttributabletoChangesinUnrealizedGainsandLossesRelatedtoLevel3AssetsandLiabilitiesStillHeldatYearEndDetails Fair Value Measurements - Total Gains and Losses Included in Earning Attributable to Changes in Unrealized Gains and Losses Related to Level 3 Assets and Liabilities Still Held at Year End (Details) Details 185 false false R186.htm 9955651 - Disclosure - Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Details) Sheet http://www.53.com/role/FairValueMeasurementsFairValuesofAssetsandLiabilitiesSignificantUnobservableLevel3InputsRecurringBasisDetails Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Details) Details 186 false false R187.htm 9955652 - Disclosure - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) Sheet http://www.53.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaNonrecurringBasisDetails Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) Details 187 false false R188.htm 9955653 - Disclosure - Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Details) Sheet http://www.53.com/role/FairValueMeasurementsFairValuesofAssetsandLiabilitiesSignificantUnobservableLevel3InputsNonrecurringBasisDetails Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Nonrecurring Basis) (Details) Details 188 false false R189.htm 9955654 - Disclosure - Fair Value Measurements - Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Residential Mortgage Loans Measured at Fair Value (Details) Sheet http://www.53.com/role/FairValueMeasurementsDifferenceBetweentheAggregateFairValueandtheAggregateUnpaidPrincipalBalanceforResidentialMortgageLoansMeasuredatFairValueDetails Fair Value Measurements - Difference Between the Aggregate Fair Value and the Aggregate Unpaid Principal Balance for Residential Mortgage Loans Measured at Fair Value (Details) Details 189 false false R190.htm 9955655 - Disclosure - Fair Value Measurements - Carrying Amounts and Estimated Fair Values for Certain Financial Instruments (Details) Sheet http://www.53.com/role/FairValueMeasurementsCarryingAmountsandEstimatedFairValuesforCertainFinancialInstrumentsDetails Fair Value Measurements - Carrying Amounts and Estimated Fair Values for Certain Financial Instruments (Details) Details 190 false false R191.htm 9955656 - Disclosure - Regulatory Capital Requirements and Capital Ratios (Details) Sheet http://www.53.com/role/RegulatoryCapitalRequirementsandCapitalRatiosDetails Regulatory Capital Requirements and Capital Ratios (Details) Details http://www.53.com/role/RegulatoryCapitalRequirementsandCapitalRatiosTables 191 false false R192.htm 9955657 - Disclosure - Parent Company Financial Statements - Condensed Statements of Income - Parent Company Only (Details) Sheet http://www.53.com/role/ParentCompanyFinancialStatementsCondensedStatementsofIncomeParentCompanyOnlyDetails Parent Company Financial Statements - Condensed Statements of Income - Parent Company Only (Details) Details 192 false false R193.htm 9955658 - Disclosure - Parent Company Financial Statements - Condensed Balance Sheet - Parent Company Only (Details) Sheet http://www.53.com/role/ParentCompanyFinancialStatementsCondensedBalanceSheetParentCompanyOnlyDetails Parent Company Financial Statements - Condensed Balance Sheet - Parent Company Only (Details) Details 193 false false R194.htm 9955659 - Disclosure - Parent Company Financial Statements - Condensed Statement of Cash Flow - Parent Company Only (Details) Sheet http://www.53.com/role/ParentCompanyFinancialStatementsCondensedStatementofCashFlowParentCompanyOnlyDetails Parent Company Financial Statements - Condensed Statement of Cash Flow - Parent Company Only (Details) Details 194 false false R195.htm 9955660 - Disclosure - Business Segments - Additional Information (Details) Sheet http://www.53.com/role/BusinessSegmentsAdditionalInformationDetails Business Segments - Additional Information (Details) Details 195 false false R196.htm 9955661 - Disclosure - Business Segments - Results of Operations and Average Assets by Segment (Details) Sheet http://www.53.com/role/BusinessSegmentsResultsofOperationsandAverageAssetsbySegmentDetails Business Segments - Results of Operations and Average Assets by Segment (Details) Details 196 false false R197.htm 9955662 - Disclosure - Business Combination - Additional Information (Details) Sheet http://www.53.com/role/BusinessCombinationAdditionalInformationDetails Business Combination - Additional Information (Details) Details 197 false false R198.htm 9955663 - Disclosure - Subsequent Events (Details) Sheet http://www.53.com/role/SubsequentEventsDetails Subsequent Events (Details) Details http://www.53.com/role/SubsequentEvent 198 false false All Reports Book All Reports fitb-20251231.htm fitb-20251231.xsd fitb-20251231_cal.xml fitb-20251231_def.xml fitb-20251231_lab.xml fitb-20251231_pre.xml fitb-20251231_g1.jpg fitb-20251231_g2.jpg fitb-20251231_g3.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true