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Investment Securities - Amortized Cost and Fair Value of Held-to-Maturity Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Held-to-Maturity
Allowance for securities held-to-maturity	$ (150)	$ (150)
Total held-to-maturity securities	2,954,881	3,013,493
Unrealized Gains	317	1,800
Unrealized Losses	(484,060)	(414,105)
Fair Value	2,471,138	2,601,188
U.S. government-sponsored entities and agencies
Held-to-Maturity
Amortized Cost	832,984	825,953
Unrealized Gains	0	0
Unrealized Losses	(168,653)	(154,827)
Fair Value	664,331	671,126
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	970,212	1,029,131
Unrealized Gains	0	0
Unrealized Losses	(169,546)	(147,137)
Fair Value	800,666	881,994
States and political subdivisions
Held-to-Maturity
Amortized Cost	1,151,835	1,158,559
Unrealized Gains	317	1,800
Unrealized Losses	(145,861)	(112,141)
Fair Value	$ 1,006,291	$ 1,048,218

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Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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