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Organization, Basis of Presentation and Recently Adopted Accounting Standards - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
USD ($)
Branch
$ / shares
Dec. 31, 2019
$ / shares
Nov. 23, 1993
$ / 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 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