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Investment Securities - Amortized Cost and Fair Value Held-to-Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Held-to-Maturity
Allowance for securities held-to-maturity	$ (150)	$ (150)
Total held-to-maturity securities	2,942,783	2,954,881
Unrealized Gains	23	317
Unrealized Losses	(457,273)	(484,060)
Fair Value	2,485,533	2,471,138
U.S. government-sponsored entities and agencies
Held-to-Maturity
Amortized Cost	834,830	832,984
Unrealized Gains	0	0
Unrealized Losses	(145,696)	(168,653)
Fair Value	689,134	664,331
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	958,004	970,212
Unrealized Gains	0	0
Unrealized Losses	(150,470)	(169,546)
Fair Value	807,534	800,666
States and political subdivisions
Held-to-Maturity
Amortized Cost	1,150,099	1,151,835
Unrealized Gains	23	317
Unrealized Losses	(161,107)	(145,861)
Fair Value	$ 989,015	$ 1,006,291

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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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