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Subsequent Event - Additional Information (Details) - Subsequent Event [Member] $ / shares in Units, $ in Billions | Apr. 26, 2021 USD ($) States Branches Office $ / shares
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Subsequent Event [Line Items] |
Ownership percent expected to be owned | 68.00%
Flagstar [Member] |
Subsequent Event [Line Items] |
Ownership percent expected to be owned | 32.00%
Percentage of stock transaction value | 100.00%
Implied total transaction value | $ | $ 2.6
Business acquisition, share price | $ / shares | $ 4.0151
Business combination, description | Following completion of the transaction, New York Community shareholders are expected to own 68% of the combined company, while Flagstar shareholders are expected to own 32% of the combined company.
Business combination estimated total assets after merge | $ | $ 87.0
Number of traditional branches | Branches | 400
Number of retail home lending offices | Office | 87
Number of state footprint | States | 28
Number of states of traditional branches | States | 9

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- Definition Business combination estimated total assets after merge. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Implied total transaction value. + References No definition available. + Details
Name: | nycb_ImpliedTotalTransactionValue
Namespace Prefix: | nycb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of retail home lending offices. + References No definition available. + Details
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Namespace Prefix: | nycb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of state footprint. + References No definition available. + Details
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Namespace Prefix: | nycb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of states of traditional branches. + References No definition available. + Details
Name: | nycb_NumberOfStatesOfTraditionalBranches
Namespace Prefix: | nycb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of Traditional Branches. + References No definition available. + Details
Name: | nycb_NumberOfTraditionalBranches
Namespace Prefix: | nycb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Ownership Percent expected to be owned + References No definition available. + Details
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Namespace Prefix: | nycb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents a description of how the entity obtained control of the acquired entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |