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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Amortized Cost    
Due after one year through five years $ 80,853  
Due after five years through ten years 126,755  
Due after ten years 14,000  
Total contractual maturities 221,608  
Available-for-sale investment securities, amortized cost 2,097,906 $ 2,190,448
Fair Value    
Due after one year through five years 81,325  
Due after five years through ten years 127,022  
Due after ten years 14,035  
Total contractual maturities 222,382  
Total available-for-sale securities 1,891,654 1,926,516
Amortized Cost    
Due after five years through ten years 51,856  
Due after ten years 50,625  
Total contractual maturities 102,481  
Amortized cost 3,658,814 3,790,650
Fair Value    
Due after five years through ten years 48,536  
Due after ten years 45,241  
Total contractual maturities 93,777  
Total held-to-maturity securities 3,230,698 3,262,509
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,111,216  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 986,633  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,260,145  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,109,328  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 35,295  
Available-for-sale investment securities, amortized cost 35,295 37,473
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 34,372  
Total available-for-sale securities 34,372 35,859
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 39,037  
Amortized cost 39,037 40,888
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 33,727  
Total held-to-maturity securities 33,727 34,309
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 786,643  
Available-for-sale investment securities, amortized cost 786,643 840,836
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 714,338  
Total available-for-sale securities 714,338 738,113
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 89,907  
Amortized cost 89,907 92,573
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 77,027  
Total held-to-maturity securities 77,027 77,719
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 243,434  
Available-for-sale investment securities, amortized cost 243,434 249,348
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 194,010  
Total available-for-sale securities 194,010 196,125
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 30,779  
Amortized cost 30,779 31,009
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 22,639  
Total held-to-maturity securities 22,639 22,343
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 45,844  
Available-for-sale investment securities, amortized cost 45,844 48,015
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 43,913  
Total available-for-sale securities 43,913 44,908
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,100,422  
Amortized cost 1,100,422 1,114,549
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 975,935  
Total held-to-maturity securities 975,935 965,506
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 765,082  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 682,639  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,296,188  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,027,593  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 426,641  
Available-for-sale investment securities, amortized cost 426,641 452,038
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 383,987  
Total available-for-sale securities 383,987 397,124
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 863,939  
Amortized cost 863,939 907,565
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 763,627  
Total held-to-maturity securities 763,627 781,545
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 338,441  
Available-for-sale investment securities, amortized cost 338,441 359,416
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 298,652  
Total available-for-sale securities 298,652 310,682
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,432,249  
Amortized cost 1,432,249 1,500,212
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,263,966  
Total held-to-maturity securities $ 1,263,966 $ 1,289,491