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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less $ 25,071  
Due after one year through five years 37,373  
Due after five years through ten years 97,695  
Due after ten years 164,865  
Total contractual maturities 325,004  
Available-for-sale investment securities, amortized cost 2,558,675 $ 3,549,599
Fair Value    
Due in one year or less 24,742  
Due after one year through five years 36,527  
Due after five years through ten years 96,879  
Due after ten years 163,484  
Total contractual maturities 321,632  
Total available-for-sale securities, Fair value, 2,255,336 3,151,133
Amortized Cost    
Due after five years through ten years 22,082  
Due after ten years 84,166  
Total contractual maturities 106,248  
Amortized cost 4,041,449 4,320,639
Fair Value    
Due after five years through ten years 20,318  
Due after ten years 76,486  
Total contractual maturities 96,804  
Total held to maturity, Fair value, 3,574,856 3,814,822
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,269,127  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,098,584  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,303,797  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,150,016  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 11,303  
Available-for-sale investment securities, amortized cost 11,303 66,792
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 10,182  
Total available-for-sale securities, Fair value, 10,182 59,723
Amortized Cost    
Amortized cost 43,885 46,302
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 43,885  
Total held to maturity, Fair value, 38,696 40,008
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 895,421  
Available-for-sale investment securities, amortized cost 895,421 1,317,718
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 783,297  
Total available-for-sale securities, Fair value, 783,297 1,160,455
Amortized Cost    
Amortized cost 99,379 106,534
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 99,379  
Total held to maturity, Fair value, 88,366 93,556
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 268,944  
Available-for-sale investment securities, amortized cost 268,944 282,700
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 218,674  
Total available-for-sale securities, Fair value, 218,674 237,853
Amortized Cost    
Amortized cost 30,795 30,544
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 30,795  
Total held to maturity, Fair value, 23,778 25,315
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 93,459  
Available-for-sale investment securities, amortized cost 93,459 130,612
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 86,431  
Total available-for-sale securities, Fair value, 86,431 119,573
Amortized Cost    
Amortized cost 1,129,738 1,150,449
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,129,738  
Total held to maturity, Fair value, 999,176 1,011,998
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 964,544  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 835,120  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,631,404  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,328,036  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 538,718  
Available-for-sale investment securities, amortized cost 538,718 738,524
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 471,150  
Total available-for-sale securities, Fair value, 471,150 653,322
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 989,130  
Amortized cost 989,130 1,080,492
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 879,659  
Total held to maturity, Fair value, 879,659 958,114
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 425,826  
Available-for-sale investment securities, amortized cost 425,826 533,103
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 363,970  
Total available-for-sale securities, Fair value, 363,970 462,132
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,642,274  
Amortized cost 1,642,274 1,798,178
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,448,377  
Total held to maturity, Fair value, $ 1,448,377 $ 1,591,133