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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due after one year through five years	$ 78,662
Due after five years through ten years	93,938
Due after ten years	45,981
Total contractual maturities	218,581
Available-for-sale investment securities, amortized cost	2,178,092	$ 2,190,448
Fair Value
Due after one year through five years	79,248
Due after five years through ten years	94,091
Due after ten years	46,012
Total contractual maturities	219,351
Total available-for-sale securities	1,986,717	1,926,516
Amortized Cost
Due after five years through ten years	51,958
Due after ten years	50,450
Total contractual maturities	102,408
Amortized cost	3,594,188	3,790,650
Fair Value
Due after five years through ten years	48,993
Due after ten years	45,681
Total contractual maturities	94,674
Total held-to-maturity securities	3,209,883	3,262,509
Mortgage-backed securities:
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,156,011
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,040,655
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,252,010
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,117,728
Residential - Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	32,641
Available-for-sale investment securities, amortized cost	32,641	37,473
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	31,834
Total available-for-sale securities	31,834	35,859
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	37,979
Amortized cost	37,979	40,888
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	33,177
Total held-to-maturity securities	33,177	34,309
Residential - Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	840,130
Available-for-sale investment securities, amortized cost	840,130	840,836
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	775,441
Total available-for-sale securities	775,441	738,113
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	88,255
Amortized cost	88,255	92,573
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	76,862
Total held-to-maturity securities	76,862	77,719
Commercial - Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	239,479
Available-for-sale investment securities, amortized cost	239,479	249,348
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	191,167
Total available-for-sale securities	191,167	196,125
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	30,817
Amortized cost	30,817	31,009
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	22,907
Total held-to-maturity securities	22,907	22,343
Commercial - Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	43,761
Available-for-sale investment securities, amortized cost	43,761	48,015
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	42,213
Total available-for-sale securities	42,213	44,908
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,094,959
Amortized cost	1,094,959	1,114,549
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	984,782
Total held-to-maturity securities	984,782	965,506
Collateralized mortgage obligations
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	803,500
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	726,711
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	2,239,770
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,997,481
Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	475,946
Available-for-sale investment securities, amortized cost	475,946	452,038
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	436,291
Total available-for-sale securities	436,291	397,124
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	842,658
Amortized cost	842,658	907,565
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	749,866
Total held-to-maturity securities	749,866	781,545
Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	327,554
Available-for-sale investment securities, amortized cost	327,554	359,416
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	290,420
Total available-for-sale securities	290,420	310,682
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,397,112
Amortized cost	1,397,112	1,500,212
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,247,615
Total held-to-maturity securities	$ 1,247,615	$ 1,289,491

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