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Borrowed Funds - Additional Information (Details)
 3 Months Ended 12 Months Ended
Nov. 04, 2002
USD ($)
AGE
$ / shares
shares
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
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       0.72% 1.90%  
Short-term FHLB advances, interest expense       $ 15,300,000 $ 1,000,000.0  
Interest expense   $ 72,071,000 $ 79,522,000 301,849,000 317,474,000 279,329,000
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   360,362,000   360,259,000 359,866,000  
Gross proceeds of BONUSES, debt   325,000,000 $ 2,150,000,000 6,925,000,000 4,785,812,000 5,667,268,000
Subordinated notes outstanding   $ 295,764,000   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          
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
Junior Subordinated Debt | New York Community Capital Trust V (BONUSESSM Units) | Capital Units            
Debt Instrument [Line Items]            
Gross proceeds of BONUSES $ 182,600,000          
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