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Investment Securities - Amortized Cost and Fair Value of Held-to-Maturity Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Held-to-Maturity
Allowance for securities held-to-maturity	$ (150)	$ (150)
Total held-to-maturity securities	2,895,488	2,954,881
Unrealized Gains	853	317
Unrealized Losses	(356,103)	(484,060)
Fair Value	2,540,238	2,471,138
U.S. government-sponsored entities and agencies
Held-to-Maturity
Amortized Cost	840,435	832,984
Unrealized Gains	0	0
Unrealized Losses	(129,526)	(168,653)
Fair Value	710,909	664,331
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	910,323	970,212
Unrealized Gains	0	0
Unrealized Losses	(127,505)	(169,546)
Fair Value	782,818	800,666
States and political subdivisions
Held-to-Maturity
Amortized Cost	1,144,880	1,151,835
Unrealized Gains	853	317
Unrealized Losses	(99,072)	(145,861)
Fair Value	$ 1,046,661	$ 1,006,291

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