XML 98 R87.htm IDEA: XBRL DOCUMENT
v3.22.1

Pending Acquisition - Additional Information (Details) - Flagstar - USD ($) $ in Billions | Apr. 27, 2022 | Apr. 26, 2021
--- | --- | ---
Business Acquisition [Line Items] |  |
Percentage of stock transaction value |  | 100.00%
Implied total transaction value |  | $ 2.6
Subsequent Event |  |
Business Acquisition [Line Items] |  |
Extend merger termination date | Oct. 31, 2022 |

X
- Definition Business acquisition extend merger termination date. + References No definition available. + Details
Name: | nycb_BusinessAcquisitionExtendMergerTerminationDate
Namespace Prefix: | nycb_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- 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

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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=nycb_FlagstarBancorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |