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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less $ 33,287  
Due after one year through five years 9,275  
Due after five years through ten years 102,374  
Due after ten years 127,751  
Total contractual maturities 272,687  
Available-for-sale investment securities, amortized cost 2,379,004 $ 2,558,675
Fair Value    
Due in one year or less 32,636  
Due after one year through five years 9,293  
Due after five years through ten years 102,643  
Due after ten years 128,093  
Total contractual maturities 272,665  
Total available-for-sale securities, Fair value, 2,067,956 2,255,336
Amortized Cost    
Due after five years through ten years 22,182  
Due after ten years 82,797  
Total contractual maturities 104,979  
Amortized cost 3,917,175 4,041,449
Fair Value    
Due after five years through ten years 19,901  
Due after ten years 73,423  
Total contractual maturities 93,324  
Total held to maturity, Fair value, 3,401,006 3,574,856
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,200,992  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,021,200  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,289,534  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,122,259  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 10,765  
Available-for-sale investment securities, amortized cost 10,765 11,303
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 9,335  
Total available-for-sale securities, Fair value, 9,335 10,182
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 42,233  
Amortized cost 42,233 43,885
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 35,703  
Total held to maturity, Fair value, 35,703 38,696
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 838,352  
Available-for-sale investment securities, amortized cost 838,352 895,421
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 721,145  
Total available-for-sale securities, Fair value, 721,145 783,297
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 96,074  
Amortized cost 96,074 99,379
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 82,282  
Total held to maturity, Fair value, 82,282 88,366
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 262,848  
Available-for-sale investment securities, amortized cost 262,848 268,944
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 208,228  
Total available-for-sale securities, Fair value, 208,228 218,674
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 30,907  
Amortized cost 30,907 30,795
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 22,723  
Total held to maturity, Fair value, 22,723 23,778
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 89,027  
Available-for-sale investment securities, amortized cost 89,027 93,459
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 82,492  
Total available-for-sale securities, Fair value, 82,492 86,431
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,120,320  
Amortized cost 1,120,320 1,129,738
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 981,551  
Total held to maturity, Fair value, 981,551 999,176
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 905,325  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 774,091  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,522,662  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,185,423  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 505,180  
Available-for-sale investment securities, amortized cost 505,180 538,718
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 434,856  
Total available-for-sale securities, Fair value, 434,856 471,150
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 949,738  
Amortized cost 949,738 989,130
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 825,744  
Total held to maturity, Fair value, 825,744 879,659
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 400,145  
Available-for-sale investment securities, amortized cost 400,145 425,826
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 339,235  
Total available-for-sale securities, Fair value, 339,235 363,970
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,572,924  
Amortized cost 1,572,924 1,642,274
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,359,679  
Total held to maturity, Fair value, $ 1,359,679 $ 1,448,377