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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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