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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Securities held-to-maturity, amortized cost, due after ten years | $ 66,936 |  |
Securities held-to-maturity, fair value, due after ten years | 55,561 |  |
Securities held-to-maturity, amortized cost | 74,811 |  |
Securities held-to-maturity, allowance for credit losses | (1,100) | $ (862) | $ (907)
Securities held-to-maturity, amortized cost | 73,711 | 57,868 |
Securities held-to-maturity, fair value | 62,550 | 62,029 |
Securities available for sale, amortized cost, due in one year or less | 10,006 |  |
Securities available for sale, fair value, due in one year or less | 9,954 |  |
Securities available for sale, amortized cost, due after one years through five years | 134,570 |  |
Securities available for sale, fair value, due after one years through five years | 127,063 |  |
Securities available for sale, amortized cost, due after five years through ten years | 195,710 |  |
Securities available for sale, fair value, due after five years through ten years | 182,341 |  |
Securities available for sale, amortized cost, due after ten years | 21,064 |  |
Securities available for sale, fair value, due after ten years | 20,505 |  |
Securities available for sale, amortized cost, total other securities | 826,881 | 786,425 |
Securities available for sale, fair value, total other securities | 735,357 | 777,236 |
US States and Political Subdivisions Debt Securities [Member] |  |  |
Securities held-to-maturity, amortized cost | 66,936 | 50,836 |
Securities held-to-maturity, fair value | 55,561 | 53,362 |
Total Other Securities [Member] |  |  |
Securities held-to-maturity, amortized cost | 66,936 |  |
Securities held-to-maturity, fair value | 55,561 |  |
Securities available for sale, amortized cost, total other securities | 361,350 |  |
Securities available for sale, fair value, total other securities | 339,863 |  |
Collateralized Mortgage Backed Securities |  |  |
Securities held-to-maturity, amortized cost | 7,875 | 7,894 |
Securities held-to-maturity, amortized cost | 7,875 | 7,894 |
Securities held-to-maturity, fair value | 6,989 | 8,667 |
Securities available for sale, amortized cost, total other securities | 454,320 | 578,057 |
Securities available for sale, fair value, total other securities | 384,283 | 572,184 |
Mutual Fund Debt Securities [Member] |  |  |
Securities available for sale, amortized cost, total other securities | 11,211 | 12,485 |
Securities available for sale, fair value, total other securities | $ 11,211 | $ 12,485 |

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