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Loans - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Purchased credit-impaired loans $ 32,991,466,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   $ 33,004,361,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Covered loans 2,341,428,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered   2,428,622,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
(Recovery of) provision for losses on loans 7,000nyb_ProvisionRecoveriesForLoanLosses (14,630,000)nyb_ProvisionRecoveriesForLoanLosses (14,630,000)nyb_ProvisionRecoveriesForLoanLosses
FDIC indemnification income 702,000us-gaap_FDICIndemnificationAssetCashPaymentsReceived 11,700,000us-gaap_FDICIndemnificationAssetCashPaymentsReceived  
Financing Receivable Troubled Debt Restructurings Rate Reductions      
Financing Receivable, Recorded Investment [Line Items]      
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates 27,400,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nyb_FinancingReceivableTroubledDebtRestructuringsRateReductionsMember		    
Financing Receivable Troubled Debt Restructurings Forbearance Of Arrears      
Financing Receivable, Recorded Investment [Line Items]      
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates 6,300,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= nyb_FinancingReceivableTroubledDebtRestructuringsForbearanceOfArrearsMember		    
Acquisition, Development and Construction      
Financing Receivable, Recorded Investment [Line Items]      
Purchased credit-impaired loans 308,526,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_AcquisitionDevelopmentAndConstructionMortgageLoansMember		   258,116,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_AcquisitionDevelopmentAndConstructionMortgageLoansMember
Number of loans classified as a non-accrual TDRs   1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_AcquisitionDevelopmentAndConstructionMortgageLoansMember		  
Loan classified as non accrual TDRs   935,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_AcquisitionDevelopmentAndConstructionMortgageLoansMember		  
Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Purchased credit-impaired loans 1,261,192,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_CommercialAndIndustrialMember		 [1]   1,109,221,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_CommercialAndIndustrialMember		 [1],[2]
Number of loans classified as a non-accrual TDRs   3us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_CommercialAndIndustrialMember		  
Loan classified as non accrual TDRs   638,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_CommercialAndIndustrialMember		  
Purchased Credit Impaired loans      
Financing Receivable, Recorded Investment [Line Items]      
Purchased credit-impaired loans 14,227,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_PurchasedCreditImpairedLoansMember		 [3]    
Purchased credit-impaired loans outstanding 17,600,000nyb_PurchasedCreditImpairedLoansAndLeasesOutstandingBalance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nyb_PurchasedCreditImpairedLoansMember		    
Mortgage Receivable      
Financing Receivable, Recorded Investment [Line Items]      
Purchased credit-impaired loans 31,686,587,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		   31,863,197,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
Unpaid principal balance of serviced loans 22,900,000,000nyb_AmountOfLoansServicedForOthers
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		   22,400,000,000nyb_AmountOfLoansServicedForOthers
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
Covered Loans      
Financing Receivable, Recorded Investment [Line Items]      
Total loans 30-89 days past due 35,723,000nyb_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember		   41,696,000nyb_FinancingReceivableRecordedInvestmentThirtyToEightyNineDaysPastDue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember
Total covered loans 90 days or more past due 151,987,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember		   157,889,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember
Covered loan portfolio, current 2,200,000,000us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember		    
(Recovery of) provision for losses on loans 877,000nyb_ProvisionRecoveriesForLoanLosses
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember		 (14,630,000)nyb_ProvisionRecoveriesForLoanLosses
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= nyb_CoveredLoansMember		  
Non-officer directors      
Financing Receivable, Recorded Investment [Line Items]      
Outstanding loans to non-officer directors 128,800,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_TitleOfIndividualAxis
= nyb_NonEmployeeDirectorMember		   129,500,000us-gaap_NotesReceivableRelatedParties
/ us-gaap_TitleOfIndividualAxis
= nyb_NonEmployeeDirectorMember
Am Trust Bank and Desert Hills Bank      
Financing Receivable, Recorded Investment [Line Items]      
Total loans, net $ 2,800,000,000us-gaap_NotesReceivableNet
/ us-gaap_BusinessAcquisitionAxis
= nyb_AmTrustBankAndDesertHillsBankMember		   $ 2,900,000,000us-gaap_NotesReceivableNet
/ us-gaap_BusinessAcquisitionAxis
= nyb_AmTrustBankAndDesertHillsBankMember
[1] Includes lease financing receivables, all of which were classified as "pass."
[2] Includes lease financing receivables, all of which were current.
[3] Includes $947,000 of multi-family loans; $10.8 million of commercial real estate loans; $1.6 million of acquisition, development, and construction loans; $675,000 of commercial and industrial loans; and $171,000 of other loans that were included in "Covered loans" at December 31, 2014.