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Consolidated Statements of Cash Flows (Parenthetical)	3 Months Ended
	Mar. 31, 2019 USD ($)
Statement of Cash Flows [Abstract]
Amortization of operating lease right-of-use assets	$ 11,700
Amortization of operating lease liability	$ 11,700

X

- Definition

Amount of amortization expense attributable to operating lease liability.

+ References

No definition available.

+ Details

Name:	nycb_OperatingLeaseLiabilityAmortization
Namespace Prefix:	nycb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of amortization expense attributable to right-of-use asset from operating lease right-of-use asset.

+ References

No definition available.

+ Details

Name:	nycb_OperatingLeaseRightOfUseAssetAmortization
Namespace Prefix:	nycb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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