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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 910,048 | $ 1,062,649
Gross Unrealized Gains | 770 | 424
Gross Unrealized Losses | (146,332) | (139,794)
Fair Value | 764,486 | 923,279
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 21,669 | 36,374
Gross Unrealized Gains | 88 | 119
Gross Unrealized Losses | (1,994) | (1,883)
Fair Value | 19,763 | 34,610
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 115,235 | 72,383
Gross Unrealized Gains | 583 | 109
Gross Unrealized Losses | (4,431) | (4,458)
Fair Value | 111,387 | 68,034
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 198,253 | 301,400
Gross Unrealized Gains | 99 | 172
Gross Unrealized Losses | (26,073) | (24,968)
Fair Value | 172,279 | 276,604
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 6,023 | 6,029
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (679) | (637)
Fair Value | 5,344 | 5,392
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 431,344 | 485,164
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (90,453) | (85,883)
Fair Value | 340,891 | 399,281
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 137,524 | 161,299
Gross Unrealized Gains | 0 | 24
Gross Unrealized Losses | (22,702) | (21,965)
Fair Value | $ 114,822 | $ 139,358

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