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Borrowed Funds - Additional Information (Details)
 12 Months Ended
Nov. 04, 2002
USD ($)
Age
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Accrued interest   $ 19,300,000 $ 23,400,000  
Short-term FHLB advances   2,300,000,000 1,000,000,000.0 $ 0
Short-term FHLB advances, average balance   $ 2,100,000,000 $ 52,400,000  
Short-term FHLB advances, average balance, weighted average interest rate   72.00% 1.90%  
Short-term FHLB advances, interest expense   $ 15,300,000 $ 1,000,000.0  
Interest expense   301,849,000 317,474,000 279,329,000
Federal funds purchased outstanding amount   0 0  
Federal funds purchased, average balance   $ 179,900,000 $ 6,800,000 $ 620,000
Federal fund purchased Weighted average interest rate   0.49% 1.70% 2.20%
Federal fund purchased, interest expenses   $ 886,000 $ 118,000 $ 14,000
Junior subordinated debentures   360,259,000 359,866,000  
Gross proceeds of BONUSES, debt   6,925,000,000 4,785,812,000 5,667,268,000
Subordinated notes outstanding   295,624,000 295,066,000  
Interest expense on subordinated notes   18,300,000 18,300,000 2,800,000
Repurchase Agreements        
Debt Instrument [Line Items]        
Accrued interest   1,700,000 1,700,000  
Interest expense   18,200,000 17,700,000 6,800,000
Short-term debt outstanding amount   0 0  
Federal Home Loan Bank Advances        
Debt Instrument [Line Items]        
Interest expense   245,700,000 259,000,000.0 248,000,000.0
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units)        
Debt Instrument [Line Items]        
Public offering of Bifurcated Option Note Unit Securities ("BONUSES units") | shares 5,500,000      
Public offering of units, offering price per share | $ / shares $ 50.00      
Warrants and capital securities non-callable period 5 years      
Gross proceeds of BONUSES, debt $ 275,000,000.0      
Difference between the assigned value and the stated liquidation amount of the capital securities is treated as an original issue discount $ 92,400,000      
Original issue discount amortized amount   65,400,000    
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units) | Capital Units        
Debt Instrument [Line Items]        
Warrant to purchase, number of shares | Age 2.4953      
Warrant to purchase, total number of shares | shares 13,700,000      
Warrant to purchase, exercise price per share | $ / shares $ 20.04      
Capital security, term (in years) 49 years      
Capital security, coupon or distribution rate 6.00%      
Capital security, per share liquidation amount | $ / shares $ 50.00      
Gross proceeds of BONUSES $ 182,600,000      
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units) | Warrant        
Debt Instrument [Line Items]        
Gross proceeds of BONUSES $ 92,400,000      
Junior Subordinated Debt        
Debt Instrument [Line Items]        
Interest expense   18,800,000 22,400,000 $ 21,700,000
FHLB - NY        
Debt Instrument [Line Items]        
Unused line of credit   7,300,000,000 7,900,000,000  
Overnight FHLB advances   0 100,000,000.0  
Line of credit, average balance   $ 2,000,000.0 $ 3,100,000  
Line of credit, weighted average interest rate   1.20% 2.10%  
Interest expense   $ 24,000 $ 66,000