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Dividend Restrictions - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Equity [Abstract] |
Dividend paid to the parent company | $ 380.0
Additional dividends that could have been paid to the Parent Company without regulatory approval | $ 301.6

X
- Definition Additional amount available for dividend distribution without prior approval from regulatory agency. + References No definition available. + Details
Name: | nycb_AdditionalAmountAvailableForDividendDistributionWithoutPriorApprovalFromRegulatoryAgency
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Dividend paid to the parent company. + References No definition available. + Details
Name: | nycb_DividendPaidToTheParentCompany
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration