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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available for sale debt securities
Amortized Cost	$ 2,190,448	$ 2,558,675
Unrealized Gains	406	43
Unrealized Losses	(264,338)	(303,382)
Total available-for-sale securities, Fair value,	1,926,516	2,255,336
Held to maturity securities
Amortized Cost	3,790,650	4,041,449
Unrealized Gains	201	195
Unrealized Losses	(528,342)	(466,788)
Total held to maturity, Fair value,	3,262,509	3,574,856
Available-for-sale investment securities
Accrued interest receivable related to available-for-sale investment securities	$ 5,600	7,200
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable
Accrued interest receivable related to held to maturity investment securities	$ 6,600	7,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Interest Receivable
Collateralized loan obligations
Available for sale debt securities
Amortized Cost	$ 173,152	249,871
Unrealized Gains	323	43
Unrealized Losses		(2,060)
Total available-for-sale securities, Fair value,	173,475	247,854
U.S. Treasury and government agency debt securities
Available for sale debt securities
Amortized Cost	8,170	33,169
Unrealized Losses	(23)	(666)
Total available-for-sale securities, Fair value,	8,147	32,503
Government-sponsored enterprises debt securities
Available for sale debt securities
Amortized Cost		20,000
Unrealized Losses		(408)
Total available-for-sale securities, Fair value,		19,592
Government agency debt securities
Held to maturity securities
Amortized Cost	49,267	52,051
Unrealized Losses	(5,398)	(4,497)
Total held to maturity, Fair value,	43,869	47,554
Residential - Government agency
Available for sale debt securities
Amortized Cost	37,473	11,303
Unrealized Losses	(1,614)	(1,121)
Total available-for-sale securities, Fair value,	35,859	10,182
Held to maturity securities
Amortized Cost	40,888	43,885
Unrealized Losses	(6,579)	(5,189)
Total held to maturity, Fair value,	34,309	38,696
Residential - Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	840,836	895,421
Unrealized Losses	(102,723)	(112,124)
Total available-for-sale securities, Fair value,	738,113	783,297
Held to maturity securities
Amortized Cost	92,573	99,379
Unrealized Losses	(14,854)	(11,013)
Total held to maturity, Fair value,	77,719	88,366
Commercial - Government agency
Available for sale debt securities
Amortized Cost	249,348	268,944
Unrealized Losses	(53,223)	(50,270)
Total available-for-sale securities, Fair value,	196,125	218,674
Held to maturity securities
Amortized Cost	31,009	30,795
Unrealized Losses	(8,666)	(7,017)
Total held to maturity, Fair value,	22,343	23,778
Commercial - Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	48,015	93,459
Unrealized Losses	(3,107)	(7,028)
Total available-for-sale securities, Fair value,	44,908	86,431
Held to maturity securities
Amortized Cost	1,114,549	1,129,738
Unrealized Gains	201	195
Unrealized Losses	(149,244)	(130,757)
Total held to maturity, Fair value,	965,506	999,176
Commercial - Non-agency
Available for sale debt securities
Amortized Cost	22,000	21,964
Unrealized Gains	83
Unrealized Losses		(281)
Total available-for-sale securities, Fair value,	22,083	21,683
Government agency
Available for sale debt securities
Amortized Cost	452,038	538,718
Unrealized Losses	(54,914)	(67,568)
Total available-for-sale securities, Fair value,	397,124	471,150
Held to maturity securities
Amortized Cost	907,565	989,130
Unrealized Losses	(126,020)	(109,471)
Total held to maturity, Fair value,	781,545	879,659
Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	359,416	425,826
Unrealized Losses	(48,734)	(61,856)
Total available-for-sale securities, Fair value,	310,682	363,970
Held to maturity securities
Amortized Cost	1,500,212	1,642,274
Unrealized Losses	(210,721)	(193,897)
Total held to maturity, Fair value,	1,289,491	1,448,377
Debt securities issued by states and political subdivisions
Held to maturity securities
Amortized Cost	54,587	54,197
Unrealized Losses	(6,860)	(4,947)
Total held to maturity, Fair value,	$ 47,727	$ 49,250

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