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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 52,126 | $ 37,007
12 months or longer | 2,451,226 | 2,402,361
Total | 2,503,352 | 2,439,368
Unrecognized Losses |  |
Less than 12 months | (789) | (430)
12 months or longer | (390,936) | (483,630)
Total | (391,725) | (484,060)
U.S. government-sponsored entities and agencies |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 705,894 | 664,331
Total | 705,894 | 664,331
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (132,641) | (168,653)
Total | (132,641) | (168,653)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 794,313 | 800,666
Total | 794,313 | 800,666
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (130,879) | (169,546)
Total | (130,879) | (169,546)
States and political subdivisions |  |
Fair Value |  |
Less than 12 months | 52,126 | 37,007
12 months or longer | 951,019 | 937,364
Total | 1,003,145 | 974,371
Unrecognized Losses |  |
Less than 12 months | (789) | (430)
12 months or longer | (127,416) | (145,431)
Total | $ (128,205) | $ (145,861)

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