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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 19,953 | $ 0
12 months or longer | 2,477,754 | 2,530,274
Total | 2,497,707 | 2,530,274
Unrecognized Losses |  |
Less than 12 months | (100) | 0
12 months or longer | (454,537) | (414,105)
Total | (454,637) | (414,105)
U.S. government-sponsored entities and agencies |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 662,735 | 671,126
Total | 662,735 | 671,126
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (164,949) | (154,827)
Total | (164,949) | (154,827)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 857,657 | 881,994
Total | 857,657 | 881,994
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (159,201) | (147,137)
Total | (159,201) | (147,137)
States and political subdivisions |  |
Fair Value |  |
Less than 12 months | 19,953 | 0
12 months or longer | 957,362 | 977,154
Total | 977,315 | 977,154
Unrecognized Losses |  |
Less than 12 months | (100) | 0
12 months or longer | (130,387) | (112,141)
Total | $ (130,487) | $ (112,141)

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