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Investment Securities - Held-to-Maturity with Unrecognized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 671 | $ 0
12 months or longer | 2,533,430 | 2,530,274
Total | 2,534,101 | 2,530,274
Unrecognized Losses |  |
Less than 12 months | (1) | 0
12 months or longer | (366,967) | (414,105)
Total | (366,968) | (414,105)
U.S. government-sponsored entities and agencies |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 700,473 | 671,126
Total | 700,473 | 671,126
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (130,687) | (154,827)
Total | (130,687) | (154,827)
Mortgage-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 854,316 | 881,994
Total | 854,316 | 881,994
Unrecognized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (130,454) | (147,137)
Total | (130,454) | (147,137)
States and political subdivisions |  |
Fair Value |  |
Less than 12 months | 671 | 0
12 months or longer | 978,641 | 977,154
Total | 979,312 | 977,154
Unrecognized Losses |  |
Less than 12 months | (1) | 0
12 months or longer | (105,826) | (112,141)
Total | $ (105,827) | $ (112,141)

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