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Investment Securities - Amortized Cost and Fair Value Held-to-Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-Maturity |  |
Allowance for securities held-to-maturity | $ (150) | $ (150)
Total held-to-maturity securities | 2,969,343 | 3,013,493
Unrealized Gains | 1,680 | 1,800
Unrealized Losses | (366,968) | (414,105)
Fair Value | 2,604,055 | 2,601,188
U.S. government-sponsored entities and agencies |  |
Held-to-Maturity |  |
Amortized Cost | 831,160 | 825,953
Unrealized Gains | 0 | 0
Unrealized Losses | (130,687) | (154,827)
Fair Value | 700,473 | 671,126
Mortgage-backed securities |  |
Held-to-Maturity |  |
Amortized Cost | 984,770 | 1,029,131
Unrealized Gains | 0 | 0
Unrealized Losses | (130,454) | (147,137)
Fair Value | 854,316 | 881,994
States and political subdivisions |  |
Held-to-Maturity |  |
Amortized Cost | 1,153,563 | 1,158,559
Unrealized Gains | 1,680 | 1,800
Unrealized Losses | (105,827) | (112,141)
Fair Value | $ 1,049,416 | $ 1,048,218

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