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Pending Acquisition - Additional Information (Details) $ / shares in Units, $ in Billions |  | 6 Months Ended
--- | --- | ---
Apr. 26, 2021 USD ($) State Office Branch $ / shares | Jun. 30, 2021
Business Acquisition [Line Items] |  |
Ownership percent expected to be owned | 68.00% |
Flagstar [Member] |  |
Business Acquisition [Line Items] |  |
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 Merger, 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 | $ | $ 85.0 |
Number of traditional branches | Branch | 400 |
Number of retail home lending offices | Office | 86 |
Number of state footprint | State | 28 |
Ownership percent expected to be owned | 32.00% |
Number of states of traditional branches | State | 9 |

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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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