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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 878,445 | $ 1,062,649
Gross Unrealized Gains | 1,301 | 424
Gross Unrealized Losses | (114,902) | (139,794)
Fair Value | 764,844 | 923,279
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 20,310 | 36,374
Gross Unrealized Gains | 130 | 119
Gross Unrealized Losses | (1,878) | (1,883)
Fair Value | 18,562 | 34,610
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 114,637 | 72,383
Gross Unrealized Gains | 605 | 109
Gross Unrealized Losses | (2,676) | (4,458)
Fair Value | 112,566 | 68,034
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 191,650 | 301,400
Gross Unrealized Gains | 374 | 172
Gross Unrealized Losses | (19,177) | (24,968)
Fair Value | 172,847 | 276,604
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 6,010 | 6,029
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (466) | (637)
Fair Value | 5,544 | 5,392
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 408,364 | 485,164
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (71,481) | (85,883)
Fair Value | 336,883 | 399,281
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 137,474 | 161,299
Gross Unrealized Gains | 192 | 24
Gross Unrealized Losses | (19,224) | (21,965)
Fair Value | $ 118,442 | $ 139,358

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