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Derivative Financial Instruments (Detail) (Nondesignated, USD $)
Mar. 31, 2015
Derivatives, Fair Value [Line Items]  
Notional Amount $ 4,111,808,000invest_DerivativeNotionalAmount
Treasury Options
  
Derivatives, Fair Value [Line Items]  
Notional Amount 800,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_TreasuryOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Treasury Futures
  
Derivatives, Fair Value [Line Items]  
Notional Amount 25,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_TreasuryFuturesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Eurodollar Futures
  
Derivatives, Fair Value [Line Items]  
Notional Amount 175,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EurodollarFutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Forward commitments to sell loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Notional Amount 1,223,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToSellLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Forward commitments to buy loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Notional Amount 1,065,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToBuyLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Interest rate lock commitments
  
Derivatives, Fair Value [Line Items]  
Notional Amount 823,808,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Other Asset
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 15,211,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Treasury Options
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,694,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_TreasuryOptionsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Treasury Futures
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 191,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_TreasuryFuturesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Eurodollar Futures
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 1,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EurodollarFutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Forward commitments to sell loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 181,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToSellLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Forward commitments to buy loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 4,282,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToBuyLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Asset | Interest rate lock commitments
  
Derivatives, Fair Value [Line Items]  
Unrealized Gain 8,862,000nyb_UnrealizedGainOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateLockCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Liability
  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 8,244,000nyb_UnrealizedLossOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Liability | Eurodollar Futures
  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 64,000nyb_UnrealizedLossOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EurodollarFutureMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Liability | Forward commitments to sell loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Unrealized Loss 7,982nyb_UnrealizedLossOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToSellLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
Other Liability | Forward commitments to buy loans/mortgage-backed securities
  
Derivatives, Fair Value [Line Items]  
Unrealized Loss $ 198,000nyb_UnrealizedLossOnDerivatives
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= nyb_ForwardCommitmentsToBuyLoansAndSecuritiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
[1] Derivatives in a net gain position are recorded as "Other assets" and derivatives in a net loss position are recorded as "Other liabilities" in the Consolidated Statements of Condition.