3.7.0.1 html 809 459 1 false 134 0 false 9 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.flagstar.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - Consolidated Statements of Financial Condition Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfFinancialCondition Consolidated Statements of Financial Condition Statements 2 false false R3.htm 1001501 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical Consolidated Statements of Financial Condition (Parenthetical) Statements 3 false false R4.htm 1002000 - Statement - Consolidated Statements of Operations Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfOperations Consolidated Statements of Operations Statements 4 false false R5.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 1004000 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfStockholdersEquity Consolidated Statements of Stockholders' Equity Statements 6 false false R7.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.flagstar.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 7 false false R8.htm 2101100 - Disclosure - Basis of Presentation Sheet http://www.flagstar.com/role/BasisOfPresentation Basis of Presentation Notes 8 false false R9.htm 2103100 - Disclosure - Investment Securities Sheet http://www.flagstar.com/role/InvestmentSecurities Investment Securities Notes 9 false false R10.htm 2104100 - Disclosure - Loans Held-for-Sale Sheet http://www.flagstar.com/role/LoansHeldForSale Loans Held-for-Sale Notes 10 false false R11.htm 2105100 - Disclosure - Loans Held-for-Investment Sheet http://www.flagstar.com/role/LoansHeldForInvestment Loans Held-for-Investment Notes 11 false false R12.htm 2109100 - Disclosure - Loans with Government Guarantees Sheet http://www.flagstar.com/role/LoansWithGovernmentGuarantees Loans with Government Guarantees Notes 12 false false R13.htm 2110100 - Disclosure - Variable Interest Entities Sheet http://www.flagstar.com/role/VariableInterestEntities Variable Interest Entities Notes 13 false false R14.htm 2111100 - Disclosure - Mortgage Servicing Rights Sheet http://www.flagstar.com/role/MortgageServicingRights Mortgage Servicing Rights Notes 14 false false R15.htm 2112100 - Disclosure - Derivative Financial Instruments Sheet http://www.flagstar.com/role/DerivativeFinancialInstruments Derivative Financial Instruments Notes 15 false false R16.htm 2114100 - Disclosure - Borrowings Sheet http://www.flagstar.com/role/Borrowings Borrowings Notes 16 false false R17.htm 2115100 - Disclosure - Representation and Warranty Reserve Sheet http://www.flagstar.com/role/RepresentationAndWarrantyReserve Representation and Warranty Reserve Notes 17 false false R18.htm 2116100 - Disclosure - Warrants and Restricted Stock Units Sheet http://www.flagstar.com/role/WarrantsAndRestrictedStockUnits Warrants and Restricted Stock Units Notes 18 false false R19.htm 2118100 - Disclosure - Accumulated Other Comprehensive Income (Loss) Sheet http://www.flagstar.com/role/AccumulatedOtherComprehensiveIncomeLoss Accumulated Other Comprehensive Income (Loss) Notes 19 false false R20.htm 2119100 - Disclosure - Earnings Per Share Sheet http://www.flagstar.com/role/EarningsPerShare Earnings Per Share Notes 20 false false R21.htm 2122100 - Disclosure - Income Taxes Sheet http://www.flagstar.com/role/IncomeTaxes Income Taxes Notes 21 false false R22.htm 2123100 - Disclosure - Regulatory Matters Sheet http://www.flagstar.com/role/RegulatoryMatters Regulatory Matters Notes 22 false false R23.htm 2124100 - Disclosure - Legal Proceedings, Contingencies and Commitments Sheet http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitments Legal Proceedings, Contingencies and Commitments Notes 23 false false R24.htm 2125100 - Disclosure - Fair Value Measurements Sheet http://www.flagstar.com/role/FairValueMeasurements Fair Value Measurements Notes 24 false false R25.htm 2126100 - Disclosure - Segment Information Sheet http://www.flagstar.com/role/SegmentInformation Segment Information Notes 25 false false R26.htm 2127100 - Disclosure - Recently Issued Accounting Pronouncements Sheet http://www.flagstar.com/role/RecentlyIssuedAccountingPronouncements Recently Issued Accounting Pronouncements Notes 26 false false R27.htm 2227202 - Disclosure - Recently Issued Accounting Pronouncements (Policies) Sheet http://www.flagstar.com/role/RecentlyIssuedAccountingPronouncementsPolicies Recently Issued Accounting Pronouncements (Policies) Policies http://www.flagstar.com/role/RecentlyIssuedAccountingPronouncements 27 false false R28.htm 2303301 - Disclosure - Investment Securities (Tables) Sheet http://www.flagstar.com/role/InvestmentSecuritiesTables Investment Securities (Tables) Tables http://www.flagstar.com/role/InvestmentSecurities 28 false false R29.htm 2305301 - Disclosure - Loans Held-for-Investment (Tables) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentTables Loans Held-for-Investment (Tables) Tables http://www.flagstar.com/role/LoansHeldForInvestment 29 false false R30.htm 2311301 - Disclosure - Mortgage Servicing Rights (Tables) Sheet http://www.flagstar.com/role/MortgageServicingRightsTables Mortgage Servicing Rights (Tables) Tables http://www.flagstar.com/role/MortgageServicingRights 30 false false R31.htm 2312301 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://www.flagstar.com/role/DerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://www.flagstar.com/role/DerivativeFinancialInstruments 31 false false R32.htm 2314301 - Disclosure - Borrowings (Tables) Sheet http://www.flagstar.com/role/BorrowingsTables Borrowings (Tables) Tables http://www.flagstar.com/role/Borrowings 32 false false R33.htm 2315301 - Disclosure - Representation and Warranty Reserve (Tables) Sheet http://www.flagstar.com/role/RepresentationAndWarrantyReserveTables Representation and Warranty Reserve (Tables) Tables http://www.flagstar.com/role/RepresentationAndWarrantyReserve 33 false false R34.htm 2316301 - Disclosure - Warrants and Restricted Stock Units (Tables) Sheet http://www.flagstar.com/role/WarrantsAndRestrictedStockUnitsTables Warrants and Restricted Stock Units (Tables) Tables http://www.flagstar.com/role/WarrantsAndRestrictedStockUnits 34 false false R35.htm 2318301 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) Sheet http://www.flagstar.com/role/AccumulatedOtherComprehensiveIncomeLossTables Accumulated Other Comprehensive Income (Loss) (Tables) Tables http://www.flagstar.com/role/AccumulatedOtherComprehensiveIncomeLoss 35 false false R36.htm 2319301 - Disclosure - Earnings Per Share (Tables) Sheet http://www.flagstar.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.flagstar.com/role/EarningsPerShare 36 false false R37.htm 2322301 - Disclosure - Income Taxes (Tables) Sheet http://www.flagstar.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.flagstar.com/role/IncomeTaxes 37 false false R38.htm 2323301 - Disclosure - Regulatory Matters (Tables) Sheet http://www.flagstar.com/role/RegulatoryMattersTables Regulatory Matters (Tables) Tables http://www.flagstar.com/role/RegulatoryMatters 38 false false R39.htm 2324301 - Disclosure - Legal Proceedings, Contingencies and Commitments (Tables) Sheet http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitmentsTables Legal Proceedings, Contingencies and Commitments (Tables) Tables http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitments 39 false false R40.htm 2325301 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.flagstar.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.flagstar.com/role/FairValueMeasurements 40 false false R41.htm 2326301 - Disclosure - Segment Information (Tables) Sheet http://www.flagstar.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.flagstar.com/role/SegmentInformation 41 false false R42.htm 2327301 - Disclosure - Recently Issued Accounting Pronouncements (Tables) Sheet http://www.flagstar.com/role/RecentlyIssuedAccountingPronouncementsTables Recently Issued Accounting Pronouncements (Tables) Tables http://www.flagstar.com/role/RecentlyIssuedAccountingPronouncements 42 false false R43.htm 2403402 - Disclosure - Investment Securities (Details) Sheet http://www.flagstar.com/role/InvestmentSecuritiesDetails Investment Securities (Details) Details http://www.flagstar.com/role/InvestmentSecuritiesTables 43 false false R44.htm 2403403 - Disclosure - Investment Securities (Available-for-sale and Held-to-maturity Securities, Unrealized Losses) (Details) Sheet http://www.flagstar.com/role/InvestmentSecuritiesAvailableForSaleAndHeldToMaturitySecuritiesUnrealizedLossesDetails Investment Securities (Available-for-sale and Held-to-maturity Securities, Unrealized Losses) (Details) Details http://www.flagstar.com/role/InvestmentSecuritiesTables 44 false false R45.htm 2403404 - Disclosure - Investment Securities (Contractual Maturity) (Details) Sheet http://www.flagstar.com/role/InvestmentSecuritiesContractualMaturityDetails Investment Securities (Contractual Maturity) (Details) Details http://www.flagstar.com/role/InvestmentSecuritiesTables 45 false false R46.htm 2404401 - Disclosure - Loans Held-for-Sale (Details) Sheet http://www.flagstar.com/role/LoansHeldForSaleDetails Loans Held-for-Sale (Details) Details http://www.flagstar.com/role/LoansHeldForSale 46 false false R47.htm 2405402 - Disclosure - Loans Held-for-Investment (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentDetails Loans Held-for-Investment (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 47 false false R48.htm 2405403 - Disclosure - Loans Held-for-Investment (Narrative) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentNarrativeDetails Loans Held-for-Investment (Narrative) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 48 false false R49.htm 2405404 - Disclosure - Loans Held-for-Investment (Allowance for Loan Losses Rollforward) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentAllowanceForLoanLossesRollforwardDetails Loans Held-for-Investment (Allowance for Loan Losses Rollforward) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 49 false false R50.htm 2405405 - Disclosure - Loans Held-for-Investment (Allowance Additional Disclosure) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentAllowanceAdditionalDisclosureDetails Loans Held-for-Investment (Allowance Additional Disclosure) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 50 false false R51.htm 2405406 - Disclosure - Loans Held-for-Investment (Past Due Loans) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentPastDueLoansDetails Loans Held-for-Investment (Past Due Loans) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 51 false false R52.htm 2405407 - Disclosure - Loans Held-for-Investment (Troubled Debt Restructurings) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentTroubledDebtRestructuringsDetails Loans Held-for-Investment (Troubled Debt Restructurings) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 52 false false R53.htm 2405408 - Disclosure - Loans Held-for-Investment (Troubled Debt Restructuring, New ) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentTroubledDebtRestructuringNewDetails Loans Held-for-Investment (Troubled Debt Restructuring, New ) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 53 false false R54.htm 2405409 - Disclosure - Loans Held-for-Investment (Impaired Loans) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentImpairedLoansDetails Loans Held-for-Investment (Impaired Loans) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 54 false false R55.htm 2405410 - Disclosure - Loans Held-for-Investment (Credit Quality Indicators) (Details) Sheet http://www.flagstar.com/role/LoansHeldForInvestmentCreditQualityIndicatorsDetails Loans Held-for-Investment (Credit Quality Indicators) (Details) Details http://www.flagstar.com/role/LoansHeldForInvestmentTables 55 false false R56.htm 2409401 - Disclosure - Loans with Government Guarantees (Details) Sheet http://www.flagstar.com/role/LoansWithGovernmentGuaranteesDetails Loans with Government Guarantees (Details) Details http://www.flagstar.com/role/LoansWithGovernmentGuarantees 56 false false R57.htm 2410401 - Disclosure - Variable Interest Entities (Details) Sheet http://www.flagstar.com/role/VariableInterestEntitiesDetails Variable Interest Entities (Details) Details http://www.flagstar.com/role/VariableInterestEntities 57 false false R58.htm 2411402 - Disclosure - Mortgage Servicing Rights (Details) Sheet http://www.flagstar.com/role/MortgageServicingRightsDetails Mortgage Servicing Rights (Details) Details http://www.flagstar.com/role/MortgageServicingRightsTables 58 false false R59.htm 2411403 - Disclosure - Mortgage Servicing Rights (Schedule of Sensitivity Analysis of Fair Value) (Details) Sheet http://www.flagstar.com/role/MortgageServicingRightsScheduleOfSensitivityAnalysisOfFairValueDetails Mortgage Servicing Rights (Schedule of Sensitivity Analysis of Fair Value) (Details) Details http://www.flagstar.com/role/MortgageServicingRightsTables 59 false false R60.htm 2411404 - Disclosure - Mortgage Servicing Rights (Income and Fees from Associated with Mortgage Servicing Asset and Mortgage Loan Subserviced) (Details) Sheet http://www.flagstar.com/role/MortgageServicingRightsIncomeAndFeesFromAssociatedWithMortgageServicingAssetAndMortgageLoanSubservicedDetails Mortgage Servicing Rights (Income and Fees from Associated with Mortgage Servicing Asset and Mortgage Loan Subserviced) (Details) Details http://www.flagstar.com/role/MortgageServicingRightsTables 60 false false R61.htm 2412402 - Disclosure - Derivative Financial Instruments (Narrative) (Details) Sheet http://www.flagstar.com/role/DerivativeFinancialInstrumentsNarrativeDetails Derivative Financial Instruments (Narrative) (Details) Details http://www.flagstar.com/role/DerivativeFinancialInstrumentsTables 61 false false R62.htm 2412403 - Disclosure - Derivative Financial Instruments (Notional Amount, Estimated Fair Value and Maturity) (Details) Sheet http://www.flagstar.com/role/DerivativeFinancialInstrumentsNotionalAmountEstimatedFairValueAndMaturityDetails Derivative Financial Instruments (Notional Amount, Estimated Fair Value and Maturity) (Details) Details http://www.flagstar.com/role/DerivativeFinancialInstrumentsTables 62 false false R63.htm 2412404 - Disclosure - Derivative Financial Instruments (Master Netting Schedule) (Details) Sheet http://www.flagstar.com/role/DerivativeFinancialInstrumentsMasterNettingScheduleDetails Derivative Financial Instruments (Master Netting Schedule) (Details) Details http://www.flagstar.com/role/DerivativeFinancialInstrumentsTables 63 false false R64.htm 2412405 - Disclosure - Derivative Financial Instruments (Schedule of Unrealized Gains or Losses) (Details) Sheet http://www.flagstar.com/role/DerivativeFinancialInstrumentsScheduleOfUnrealizedGainsOrLossesDetails Derivative Financial Instruments (Schedule of Unrealized Gains or Losses) (Details) Details http://www.flagstar.com/role/DerivativeFinancialInstrumentsTables 64 false false R65.htm 2414402 - Disclosure - Borrowings (FHLB Advances) (Details) Sheet http://www.flagstar.com/role/BorrowingsFhlbAdvancesDetails Borrowings (FHLB Advances) (Details) Details http://www.flagstar.com/role/BorrowingsTables 65 false false R66.htm 2414403 - Disclosure - Borrowings (Narrative) (Details) Sheet http://www.flagstar.com/role/BorrowingsNarrativeDetails Borrowings (Narrative) (Details) Details http://www.flagstar.com/role/BorrowingsTables 66 false false R67.htm 2414404 - Disclosure - Borrowings (Schedule of FHLB Advances, Disclosures) (Details) Sheet http://www.flagstar.com/role/BorrowingsScheduleOfFhlbAdvancesDisclosuresDetails Borrowings (Schedule of FHLB Advances, Disclosures) (Details) Details http://www.flagstar.com/role/BorrowingsTables 67 false false R68.htm 2414405 - Disclosure - Borrowings (Schedule of FHLB, Advances, Maturity Summary) (Details) Sheet http://www.flagstar.com/role/BorrowingsScheduleOfFhlbAdvancesMaturitySummaryDetails Borrowings (Schedule of FHLB, Advances, Maturity Summary) (Details) Details http://www.flagstar.com/role/BorrowingsTables 68 false false R69.htm 2414406 - Disclosure - Borrowings (Trust Preferred Securities) (Details) Sheet http://www.flagstar.com/role/BorrowingsTrustPreferredSecuritiesDetails Borrowings (Trust Preferred Securities) (Details) Details http://www.flagstar.com/role/BorrowingsTables 69 false false R70.htm 2415402 - Disclosure - Representation and Warranty Reserve (Details) Sheet http://www.flagstar.com/role/RepresentationAndWarrantyReserveDetails Representation and Warranty Reserve (Details) Details http://www.flagstar.com/role/RepresentationAndWarrantyReserveTables 70 false false R71.htm 2416402 - Disclosure - Warrants and Restricted Stock Units (May Investors) (Details) Sheet http://www.flagstar.com/role/WarrantsAndRestrictedStockUnitsMayInvestorsDetails Warrants and Restricted Stock Units (May Investors) (Details) Details http://www.flagstar.com/role/WarrantsAndRestrictedStockUnitsTables 71 false false R72.htm 2416403 - Disclosure - Warrants and Restricted Stock Units (Restricted Stock Units) (Details) Sheet http://www.flagstar.com/role/WarrantsAndRestrictedStockUnitsRestrictedStockUnitsDetails Warrants and Restricted Stock Units (Restricted Stock Units) (Details) Details http://www.flagstar.com/role/WarrantsAndRestrictedStockUnitsTables 72 false false R73.htm 2418402 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.flagstar.com/role/AccumulatedOtherComprehensiveIncomeLossDetails Accumulated Other Comprehensive Income (Loss) (Details) Details http://www.flagstar.com/role/AccumulatedOtherComprehensiveIncomeLossTables 73 false false R74.htm 2419402 - Disclosure - Earnings Per Share (Details) Sheet http://www.flagstar.com/role/EarningsPerShareDetails Earnings Per Share (Details) Details http://www.flagstar.com/role/EarningsPerShareTables 74 false false R75.htm 2419403 - Disclosure - Earnings Per Share (Anti-dilutive) (Details) Sheet http://www.flagstar.com/role/EarningsPerShareAntiDilutiveDetails Earnings Per Share (Anti-dilutive) (Details) Details http://www.flagstar.com/role/EarningsPerShareTables 75 false false R76.htm 2422402 - Disclosure - Income Taxes (Details) Sheet http://www.flagstar.com/role/IncomeTaxesDetails Income Taxes (Details) Details http://www.flagstar.com/role/IncomeTaxesTables 76 false false R77.htm 2423402 - Disclosure - Regulatory Matters (Details) Sheet http://www.flagstar.com/role/RegulatoryMattersDetails Regulatory Matters (Details) Details http://www.flagstar.com/role/RegulatoryMattersTables 77 false false R78.htm 2424402 - Disclosure - Legal Proceedings, Contingencies and Commitments (Narratives) (Details) Sheet http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitmentsNarrativesDetails Legal Proceedings, Contingencies and Commitments (Narratives) (Details) Details http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitmentsTables 78 false false R79.htm 2424403 - Disclosure - Legal Proceedings, Contingencies and Commitments (Credit Commitments) (Details) Sheet http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitmentsCreditCommitmentsDetails Legal Proceedings, Contingencies and Commitments (Credit Commitments) (Details) Details http://www.flagstar.com/role/LegalProceedingsContingenciesAndCommitmentsTables 79 false false R80.htm 2425402 - Disclosure - Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 80 false false R81.htm 2425403 - Disclosure - Fair Value Measurements (Narrative) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsNarrativeDetails Fair Value Measurements (Narrative) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 81 false false R82.htm 2425404 - Disclosure - Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsFairValueMeasurementsUsingSignificantUnobservableInputsDetails Fair Value Measurements (Fair Value Measurements Using Significant Unobservable Inputs) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 82 false false R83.htm 2425405 - Disclosure - Fair Value Measurements (Level 3 Quantitative Information) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsLevel3QuantitativeInformationDetails Fair Value Measurements (Level 3 Quantitative Information) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 83 false false R84.htm 2425406 - Disclosure - Fair Value Measurements (Fair Value Inputs, Assets, Quantitative Disclosures) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsFairValueInputsAssetsQuantitativeDisclosuresDetails Fair Value Measurements (Fair Value Inputs, Assets, Quantitative Disclosures) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 84 false false R85.htm 2425407 - Disclosure - Fair Value Measurements (Assets Measured at Fair Value on a Non-recurring Basis) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails Fair Value Measurements (Assets Measured at Fair Value on a Non-recurring Basis) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 85 false false R86.htm 2425408 - Disclosure - Fair Value Measurements (Assets Measured on a Nonrecurring Basis, Level 3 Quantitative Information) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsAssetsMeasuredOnNonrecurringBasisLevel3QuantitativeInformationDetails Fair Value Measurements (Assets Measured on a Nonrecurring Basis, Level 3 Quantitative Information) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 86 false false R87.htm 2425409 - Disclosure - Fair Value Measurements (Fair Value of Financial Instruments) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsFairValueOfFinancialInstrumentsDetails Fair Value Measurements (Fair Value of Financial Instruments) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 87 false false R88.htm 2425410 - Disclosure - Fair Value Measurements (Fair Value Option Disclosures) (Details) Sheet http://www.flagstar.com/role/FairValueMeasurementsFairValueOptionDisclosuresDetails Fair Value Measurements (Fair Value Option Disclosures) (Details) Details http://www.flagstar.com/role/FairValueMeasurementsTables 88 false false R89.htm 2426402 - Disclosure - Segment Information (Details) Sheet http://www.flagstar.com/role/SegmentInformationDetails Segment Information (Details) Details http://www.flagstar.com/role/SegmentInformationTables 89 false false All Reports Book All Reports fbc-20170630.xml fbc-20170630.xsd fbc-20170630_cal.xml fbc-20170630_def.xml fbc-20170630_lab.xml fbc-20170630_pre.xml true true