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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost, due after ten years | $ 50,832 |  |  |  |  |
Securities held-to-maturity, fair value, due after ten years | 52,753 |  |  |  |  |
Securities held-to-maturity, amortized cost | 58,731 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (843) | $ (844) | $ (907) | $ (402) | $ (402) | $ (340)
Securities held-to-maturity, amortized cost | 57,888 |  | 57,832 |  |  |
Securities held-to-maturity, fair value | 61,451 |  | 63,529 |  |  |
Securities available for sale, amortized cost, due after one years through five years | 20,000 |  |  |  |  |
Securities available for sale, fair value, due after one years through five years | 19,932 |  |  |  |  |
Securities available for sale, amortized cost, due after five years through ten years | 169,572 |  |  |  |  |
Securities available for sale, fair value, due after five years through ten years | 167,957 |  |  |  |  |
Securities available for sale, amortized cost, due after ten years | 12,207 |  |  |  |  |
Securities available for sale, fair value, due after ten years | 12,193 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 799,936 |  | 646,112 |  |  |
Securities available for sale, fair value, total other securities | 796,799 |  | 647,974 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,832 |  | 50,825 |  |  |
Securities held-to-maturity, fair value | 52,753 |  | 54,538 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 50,832 |  |  |  |  |
Securities held-to-maturity, fair value | 52,753 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 201,779 |  |  |  |  |
Securities available for sale, fair value, total other securities | 200,082 |  |  |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,899 |  | 7,914 |  |  |
Securities held-to-maturity, amortized cost | 7,899 |  | 7,914 |  |  |
Securities held-to-maturity, fair value | 8,698 |  | 8,991 |  |  |
Securities available for sale, amortized cost, total other securities | 585,585 |  | 395,101 |  |  |
Securities available for sale, fair value, total other securities | 584,145 |  | 404,460 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 12,572 |  | 12,703 |  |  |
Securities available for sale, fair value, total other securities | $ 12,572 |  | $ 12,703 |  |  |

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