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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Statement of Cash Flows [Abstract] |  |
Amortization of operating lease right-of-use assets | $ 4.1 | $ 11.7
Amortization of operating lease liability | $ 4.1 | $ 11.7

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