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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,105,472 | $ 1,735,000
Gross Unrealized Gains | 280 | 241
Gross Unrealized Losses | (196,644) | (201,299)
Fair Value | 909,108 | 1,533,942
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 170,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (5,340)
Fair Value |  | 164,660
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 38,200 | 154,066
Gross Unrealized Gains | 71 | 204
Gross Unrealized Losses | (4,732) | (9,368)
Fair Value | 33,539 | 144,902
Residential mortgage backed securities: | Government agency mortgage backed securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 321,245 | 508,415
Gross Unrealized Gains | 2 | 37
Gross Unrealized Losses | (49,799) | (52,036)
Fair Value | 271,448 | 456,416
Residential mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 501,793 | 605,033
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (108,896) | (103,864)
Fair Value | 392,897 | 501,169
Commercial mortgage backed securities: | Government agency mortgage backed securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 6,036 | 11,166
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (908) | (1,053)
Fair Value | 5,128 | 10,113
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 165,812 | 211,435
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (27,071) | (25,589)
Fair Value | 138,741 | 185,846
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 72,386 | 74,885
Gross Unrealized Gains | 207 | 0
Gross Unrealized Losses | (5,238) | (4,049)
Fair Value | $ 67,355 | $ 70,836

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