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Investment Securities - Amortized Cost and Fair Value Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Held-to-Maturity |  |
Allowance for securities held-to-maturity | $ (150) | $ (150)
Total held-to-maturity securities | 2,910,215 | 2,954,881
Unrealized Gains | 182 | 317
Unrealized Losses | (391,725) | (484,060)
Fair Value | 2,518,672 | 2,471,138
U.S. government-sponsored entities and agencies |  |
Held-to-Maturity |  |
Amortized Cost | 838,535 | 832,984
Unrealized Gains | 0 | 0
Unrealized Losses | (132,641) | (168,653)
Fair Value | 705,894 | 664,331
Mortgage-backed securities |  |
Held-to-Maturity |  |
Amortized Cost | 925,192 | 970,212
Unrealized Gains | 0 | 0
Unrealized Losses | (130,879) | (169,546)
Fair Value | 794,313 | 800,666
States and political subdivisions |  |
Held-to-Maturity |  |
Amortized Cost | 1,146,638 | 1,151,835
Unrealized Gains | 182 | 317
Unrealized Losses | (128,205) | (145,861)
Fair Value | $ 1,018,615 | $ 1,006,291

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