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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Amortized Cost    
Due after one year through five years $ 9,275  
Due after five years through ten years 127,138  
Due after ten years 22,000  
Total contractual maturities 158,413  
Available-for-sale investment securities, amortized cost 2,091,034 $ 2,190,448
Fair Value    
Due after one year through five years 9,285  
Due after five years through ten years 127,218  
Due after ten years 22,005  
Total contractual maturities 158,508  
Total available-for-sale securities 1,858,428 1,926,516
Amortized Cost    
Due after five years through ten years 52,632  
Due after ten years 51,162  
Total contractual maturities 103,794  
Amortized cost 3,724,908 3,790,650
Fair Value    
Due after five years through ten years 48,343  
Due after ten years 45,069  
Total contractual maturities 93,412  
Total held-to-maturity securities 3,250,275 3,262,509
Mortgage-backed securities:    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,142,984  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,002,509  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,266,453  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,101,424  
Residential - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 36,376  
Available-for-sale investment securities, amortized cost 36,376 37,473
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 35,314  
Total available-for-sale securities 35,314 35,859
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 39,912  
Amortized cost 39,912 40,888
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 34,241  
Total held-to-maturity securities 34,241 34,309
Residential - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 814,089  
Available-for-sale investment securities, amortized cost 814,089 840,836
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 727,417  
Total available-for-sale securities 727,417 738,113
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 91,523  
Amortized cost 91,523 92,573
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 78,012  
Total held-to-maturity securities 78,012 77,719
Commercial - Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 246,139  
Available-for-sale investment securities, amortized cost 246,139 249,348
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 195,766  
Total available-for-sale securities 195,766 196,125
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 31,056  
Amortized cost 31,056 31,009
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 22,358  
Total held-to-maturity securities 22,358 22,343
Commercial - Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 46,380  
Available-for-sale investment securities, amortized cost 46,380 48,015
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 44,012  
Total available-for-sale securities 44,012 44,908
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,103,962  
Amortized cost 1,103,962 1,114,549
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 966,813  
Total held-to-maturity securities 966,813 965,506
Collateralized mortgage obligations    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 789,637  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 697,411  
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 2,354,661  
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 2,055,439  
Government agency    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 440,756  
Available-for-sale investment securities, amortized cost 440,756 452,038
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 391,674  
Total available-for-sale securities 391,674 397,124
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 887,439  
Amortized cost 887,439 907,565
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 775,914  
Total held-to-maturity securities 775,914 781,545
Government-sponsored enterprises    
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 348,881  
Available-for-sale investment securities, amortized cost 348,881 359,416
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 305,737  
Total available-for-sale securities 305,737 310,682
Amortized Cost    
Mortgaged-backed securities and collateralized mortgage obligations 1,467,222  
Amortized cost 1,467,222 1,500,212
Fair Value    
Mortgaged-backed securities and collateralized mortgage obligations 1,279,525  
Total held-to-maturity securities $ 1,279,525 $ 1,289,491