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Pending Acquisition - Additional Information (Details) $ / shares in Units, $ in Billions |  | 12 Months Ended
--- | --- | ---
Apr. 26, 2021 USD ($) Office State Branch $ / shares | Dec. 31, 2021
Business Acquisition [Line Items] |  |
Ownership percent expected to be owned | 68.00% |
Flagstar [Member] |  |
Business Acquisition [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 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 | 83 |
Number of state footprint | State | 28 |

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