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Organization, Basis of Presentation, and Impact of Recent Accounting Pronouncements - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Branch
$ / shares
Dec. 31, 2020
$ / shares
Organization and Basis of Presentation [Line Items]    
Common stock, par | $ / shares $ 0.01 $ 0.01
Description of nine stock splits ($0.93 per share on a split-adjusted basis, reflecting the impact of nine stock splits between 1994 and 2004)  
Cumulative effect on retained earnings, reduction in tax | $ $ 10.5  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member  
New York Community Bank    
Organization and Basis of Presentation [Line Items]    
Number of branches | Branch 237  
New York Community Bank | Corporate Segment    
Organization and Basis of Presentation [Line Items]    
Number of branches | Branch 19  
New York Community Bank | Corporate and Other    
Organization and Basis of Presentation [Line Items]    
Number of branches | Branch 218  
IPO    
Organization and Basis of Presentation [Line Items]    
Shares issued, price per share | $ / shares $ 25.00  
Shares issued, price per share, split adjusted basis | $ / shares $ 0.93