Investment Securities - Amortized Cost and Fair Value Held-to-Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Held-to-Maturity
Allowance for securities held-to-maturity	$ (150)	$ (150)
Total held-to-maturity securities	2,926,368	2,954,881
Unrealized Gains	7	317
Unrealized Losses	(456,028)	(484,060)
Fair Value	2,470,347	2,471,138
U.S. government-sponsored entities and agencies
Held-to-Maturity
Amortized Cost	836,662	832,984
Unrealized Gains	0	0
Unrealized Losses	(142,285)	(168,653)
Fair Value	694,377	664,331
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	941,464	970,212
Unrealized Gains	0	0
Unrealized Losses	(145,385)	(169,546)
Fair Value	796,079	800,666
States and political subdivisions
Held-to-Maturity
Amortized Cost	1,148,392	1,151,835
Unrealized Gains	7	317
Unrealized Losses	(168,358)	(145,861)
Fair Value	$ 980,041	$ 1,006,291

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

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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