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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost, due after ten years | $ 66,740 |  |  |
Securities held-to-maturity, fair value, due after ten years | 60,732 |  |  |
Securities held-to-maturity, amortized cost | 74,610 |  |  |
Securities held-to-maturity, allowance for credit losses | (1,087) | $ (1,100) | $ (986) | $ (862)
Securities held-to-maturity, amortized cost | 73,523 | 73,711 |  |
Securities held-to-maturity, fair value | 67,869 | 62,550 |  |
Securities available for sale, amortized cost, due in one year or less | 59,843 |  |  |
Securities available for sale, fair value, due in one year or less | 58,258 |  |  |
Securities available for sale, amortized cost, due after one years through five years | 74,798 |  |  |
Securities available for sale, fair value, due after one years through five years | 69,629 |  |  |
Securities available for sale, amortized cost, due after five years through ten years | 236,428 |  |  |
Securities available for sale, fair value, due after five years through ten years | 221,597 |  |  |
Securities available for sale, amortized cost, due after ten years | 71,892 |  |  |
Securities available for sale, fair value, due after ten years | 70,874 |  |  |
Securities available for sale, amortized cost, total other securities | 898,819 | 826,881 |  |
Securities available for sale, fair value, total other securities | 811,928 | 735,357 |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Securities held-to-maturity, amortized cost | 66,740 | 66,936 |  |
Securities held-to-maturity, fair value | 60,732 | 55,561 |  |
Total Other Securities [Member] |  |  |  |
Securities held-to-maturity, amortized cost | 66,740 |  |  |
Securities held-to-maturity, fair value | 60,732 |  |  |
Securities available for sale, amortized cost, total other securities | 442,961 |  |  |
Securities available for sale, fair value, total other securities | 420,358 |  |  |
Collateralized Mortgage Backed Securities |  |  |  |
Securities held-to-maturity, amortized cost | 7,870 | 7,875 |  |
Securities held-to-maturity, amortized cost | 7,870 |  |  |
Securities held-to-maturity, fair value | 7,137 | 6,989 |  |
Securities available for sale, amortized cost, total other securities | 444,398 | 454,320 |  |
Securities available for sale, fair value, total other securities | 380,110 | 384,283 |  |
Mutual Fund Debt Securities [Member] |  |  |  |
Securities available for sale, amortized cost, total other securities | 11,460 | 11,211 |  |
Securities available for sale, fair value, total other securities | $ 11,460 | $ 11,211 |  |

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