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Investment Securities - Amortized Cost and Fair Value, by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 8,170
Due after one year through five years	9,275
Due after five years through ten years	146,351
Due after ten years	39,526
Total contractual maturities	203,322
Available-for-sale investment securities, amortized cost	2,190,448	$ 2,558,675
Fair Value
Due in one year or less	8,147
Due after one year through five years	9,296
Due after five years through ten years	146,596
Due after ten years	39,666
Total contractual maturities	203,705
Total available-for-sale securities, Fair value,	1,926,516	2,255,336
Amortized Cost
Due after five years through ten years	52,531
Due after ten years	51,323
Total contractual maturities	103,854
Amortized cost	3,790,650	4,041,449
Fair Value
Due after five years through ten years	47,264
Due after ten years	44,332
Total contractual maturities	91,596
Total held to maturity, Fair value,	3,262,509	3,574,856
Mortgage-backed securities:
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,175,672
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,015,005
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,279,019
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,099,877
Residential - Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	37,473
Available-for-sale investment securities, amortized cost	37,473	11,303
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	35,859
Total available-for-sale securities, Fair value,	35,859	10,182
Amortized Cost
Amortized cost	40,888	43,885
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	40,888
Total held to maturity, Fair value,	34,309	38,696
Residential - Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	840,836
Available-for-sale investment securities, amortized cost	840,836	895,421
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	738,113
Total available-for-sale securities, Fair value,	738,113	783,297
Amortized Cost
Amortized cost	92,573	99,379
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	92,573
Total held to maturity, Fair value,	77,719	88,366
Commercial - Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	249,348
Available-for-sale investment securities, amortized cost	249,348	268,944
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	196,125
Total available-for-sale securities, Fair value,	196,125	218,674
Amortized Cost
Amortized cost	31,009	30,795
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	31,009
Total held to maturity, Fair value,	22,343	23,778
Commercial - Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	48,015
Available-for-sale investment securities, amortized cost	48,015	93,459
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	44,908
Total available-for-sale securities, Fair value,	44,908	86,431
Amortized Cost
Amortized cost	1,114,549	1,129,738
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,114,549
Total held to maturity, Fair value,	965,506	999,176
Collateralized mortgage obligations
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	811,454
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	707,806
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	2,407,777
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	2,071,036
Government agency
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	452,038
Available-for-sale investment securities, amortized cost	452,038	538,718
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	397,124
Total available-for-sale securities, Fair value,	397,124	471,150
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	907,565
Amortized cost	907,565	989,130
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	781,545
Total held to maturity, Fair value,	781,545	879,659
Government-sponsored enterprises
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	359,416
Available-for-sale investment securities, amortized cost	359,416	425,826
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	310,682
Total available-for-sale securities, Fair value,	310,682	363,970
Amortized Cost
Mortgaged-backed securities and collateralized mortgage obligations	1,500,212
Amortized cost	1,500,212	1,642,274
Fair Value
Mortgaged-backed securities and collateralized mortgage obligations	1,289,491
Total held to maturity, Fair value,	$ 1,289,491	$ 1,448,377

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