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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Securities held-to-maturity, amortized cost, due after ten years | $ 50,836 |
Securities held-to-maturity, fair value, due after ten years | 53,362 |
Securities held-to-maturity, amortized cost | 58,730 |
Securities held-to-maturity, allowance for credit losses | (862) | $ (907)
Securities held-to-maturity, amortized cost | 57,868 | 57,832
Securities held-to-maturity, fair value | 62,029 | 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 | 19,865 |
Securities available for sale, amortized cost, due after five years through ten years | 163,572 |
Securities available for sale, fair value, due after five years through ten years | 160,417 |
Securities available for sale, amortized cost, due after ten years | 12,311 |
Securities available for sale, fair value, due after ten years | 12,285 |
Securities available for sale, amortized cost, total other securities | 786,425 | 646,112
Securities available for sale, fair value, total other securities | 777,236 | 647,974
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,836 | 50,825
Securities held-to-maturity, fair value | 53,362 | 54,538
Total Other Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,836 |
Securities held-to-maturity, fair value | 53,362 |
Securities available for sale, amortized cost, total other securities | 195,883 |
Securities available for sale, fair value, total other securities | 192,567 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,894 | 7,914
Securities held-to-maturity, amortized cost | 7,894 | 7,914
Securities held-to-maturity, fair value | 8,667 | 8,991
Securities available for sale, amortized cost, total other securities | 578,057 | 395,101
Securities available for sale, fair value, total other securities | 572,184 | 404,460
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,485 | 12,703
Securities available for sale, fair value, total other securities | $ 12,485 | $ 12,703

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