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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