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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 0 | $ 37,007
12 months or longer | 2,489,058 | 2,402,361
Total | 2,489,058 | 2,439,368
Unrecognized Losses |  |
Less than 12 months | 0 | (430)
12 months or longer | (356,103) | (483,630)
Total | (356,103) | (484,060)
U.S. government-sponsored entities and agencies |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 710,909 | 664,331
Total | 710,909 | 664,331
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (129,526) | (168,653)
Total | (129,526) | (168,653)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 782,818 | 800,666
Total | 782,818 | 800,666
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (127,505) | (169,546)
Total | (127,505) | (169,546)
States and political subdivisions |  |
Fair Value |  |
Less than 12 months | 0 | 37,007
12 months or longer | 995,331 | 937,364
Total | 995,331 | 974,371
Unrecognized Losses |  |
Less than 12 months | 0 | (430)
12 months or longer | (99,072) | (145,431)
Total | $ (99,072) | $ (145,861)

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