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Activity in Allowance for Losses on Covered Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Valuation Allowance [Line Items]
Balance, beginning of period	$ 23,701	$ 31,395
Provision for (recovery of) losses	(4,008)	(176)
Balance, end of period	17,906	28,498
Covered
Valuation Allowance [Line Items]
Provision for (recovery of) losses	$ (5,795)	$ (2,897)

X

- Definition

Provision Recoveries For Loan Losses

+ References

No definition available.

+ Details

Name:	nyb_ProvisionRecoveriesForLoanLosses
Namespace Prefix:	nyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of allowance for loan and lease losses covered by loss sharing agreements.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableAllowanceCovered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ValuationAllowanceLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis=nyb_CoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: