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Investment Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available for sale debt securities
Amortized Cost	$ 2,178,092	$ 2,190,448
Unrealized Gains	3,978	406
Unrealized Losses	(195,353)	(264,338)
Total available-for-sale securities	1,986,717	1,926,516
Held to maturity securities
Amortized Cost	3,594,188	3,790,650
Unrealized Gains	225	201
Unrealized Losses	(384,530)	(528,342)
Total held-to-maturity securities	3,209,883	3,262,509
Available-for-sale investment securities
Accrued interest receivable related to available-for-sale investment securities	5,000	5,600
Accrued interest receivable related to held to maturity investment securities	6,600	6,600
Collateralized loan obligations
Available for sale debt securities
Amortized Cost	97,788	173,152
Unrealized Gains	153	323
Total available-for-sale securities	97,941	173,475
Government agency debt securities
Available for sale debt securities
Amortized Cost		8,170
Unrealized Losses		(23)
Total available-for-sale securities		8,147
Held to maturity securities
Amortized Cost	47,514	49,267
Unrealized Losses	(3,557)	(5,398)
Total held-to-maturity securities	43,957	43,869
Residential - Government agency
Available for sale debt securities
Amortized Cost	32,641	37,473
Unrealized Gains	279
Unrealized Losses	(1,086)	(1,614)
Total available-for-sale securities	31,834	35,859
Held to maturity securities
Amortized Cost	37,979	40,888
Unrealized Losses	(4,802)	(6,579)
Total held-to-maturity securities	33,177	34,309
Residential - Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	840,130	840,836
Unrealized Gains	1,564
Unrealized Losses	(66,253)	(102,723)
Total available-for-sale securities	775,441	738,113
Held to maturity securities
Amortized Cost	88,255	92,573
Unrealized Losses	(11,393)	(14,854)
Total held-to-maturity securities	76,862	77,719
Commercial - Government agency
Available for sale debt securities
Amortized Cost	239,479	249,348
Unrealized Losses	(48,312)	(53,223)
Total available-for-sale securities	191,167	196,125
Held to maturity securities
Amortized Cost	30,817	31,009
Unrealized Losses	(7,910)	(8,666)
Total held-to-maturity securities	22,907	22,343
Commercial - Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	43,761	48,015
Unrealized Losses	(1,548)	(3,107)
Total available-for-sale securities	42,213	44,908
Held to maturity securities
Amortized Cost	1,094,959	1,114,549
Unrealized Gains	225	201
Unrealized Losses	(110,402)	(149,244)
Total held-to-maturity securities	984,782	965,506
Commercial - Non-agency
Available for sale debt securities
Amortized Cost	120,793	22,000
Unrealized Gains	641	83
Unrealized Losses	(24)
Total available-for-sale securities	121,410	22,083
Government agency
Available for sale debt securities
Amortized Cost	475,946	452,038
Unrealized Gains	800
Unrealized Losses	(40,455)	(54,914)
Total available-for-sale securities	436,291	397,124
Held to maturity securities
Amortized Cost	842,658	907,565
Unrealized Losses	(92,792)	(126,020)
Total held-to-maturity securities	749,866	781,545
Government-sponsored enterprises
Available for sale debt securities
Amortized Cost	327,554	359,416
Unrealized Gains	541
Unrealized Losses	(37,675)	(48,734)
Total available-for-sale securities	290,420	310,682
Held to maturity securities
Amortized Cost	1,397,112	1,500,212
Unrealized Losses	(149,497)	(210,721)
Total held-to-maturity securities	1,247,615	1,289,491
Debt securities issued by states and political subdivisions
Held to maturity securities
Amortized Cost	54,894	54,587
Unrealized Losses	(4,177)	(6,860)
Total held-to-maturity securities	$ 50,717	$ 47,727

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