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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 0 | $ 1,560,831
12 months or longer | 2,530,274 | 1,052,753
Total | 2,530,274 | 2,613,584
Unrecognized Losses |  |
Less than 12 months | 0 | (280,316)
12 months or longer | (414,105) | (165,370)
Total | (414,105) | (445,686)
U.S. government-sponsored entities and agencies |  |
Fair Value |  |
Less than 12 months | 0 | 354,293
12 months or longer | 671,126 | 302,066
Total | 671,126 | 656,359
Unrecognized Losses |  |
Less than 12 months | 0 | (110,523)
12 months or longer | (154,827) | (52,287)
Total | (154,827) | (162,810)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 367,849
12 months or longer | 881,994 | 615,114
Total | 881,994 | 982,963
Unrecognized Losses |  |
Less than 12 months | 0 | (42,438)
12 months or longer | (147,137) | (81,416)
Total | (147,137) | (123,854)
States and political subdivisions |  |
Fair Value |  |
Less than 12 months | 0 | 838,689
12 months or longer | 977,154 | 135,573
Total | 977,154 | 974,262
Unrecognized Losses |  |
Less than 12 months | 0 | (127,355)
12 months or longer | (112,141) | (31,667)
Total | $ (112,141) | $ (159,022)

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