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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost, due in one year or less | $ 10,026 |  |  |  |  |
Securities held-to-maturity, fair value, due in one year or less | 9,920 |  |  |  |  |
Securities held-to-maturity, amortized cost, due after ten years | 67,315 |  |  |  |  |
Securities held-to-maturity, fair value, due after ten years | 57,064 |  |  |  |  |
Securities held-to-maturity, amortized cost | 75,200 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (1,085) | $ (986) | $ (862) | $ (844) | $ (915) | $ (907)
Securities held-to-maturity, amortized cost | 74,115 |  | 57,868 |  |  |
Securities held-to-maturity, fair value | 64,560 |  | 62,029 |  |  |
Securities available for sale, amortized cost, due after one years through five years | 99,429 |  |  |  |  |
Securities available for sale, fair value, due after one years through five years | 96,645 |  |  |  |  |
Securities available for sale, amortized cost, due after five years through ten years | 205,672 |  |  |  |  |
Securities available for sale, fair value, due after five years through ten years | 193,191 |  |  |  |  |
Securities available for sale, amortized cost, due after ten years | 36,019 |  |  |  |  |
Securities available for sale, fair value, due after ten years | 35,391 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 930,362 |  | 786,425 |  |  |
Securities available for sale, fair value, total other securities | 857,654 |  | 777,236 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 67,315 |  | 50,836 |  |  |
Securities held-to-maturity, fair value | 57,064 |  | 53,362 |  |  |
Total Other Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 67,315 |  |  |  |  |
Securities held-to-maturity, fair value | 57,064 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 351,146 |  |  |  |  |
Securities available for sale, fair value, total other securities | 335,147 |  |  |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,885 |  | 7,894 |  |  |
Securities held-to-maturity, amortized cost | 7,885 |  | 7,894 |  |  |
Securities held-to-maturity, fair value | 7,496 |  | 8,667 |  |  |
Securities available for sale, amortized cost, total other securities | 567,643 |  | 578,057 |  |  |
Securities available for sale, fair value, total other securities | 510,934 |  | 572,184 |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 11,573 |  | 12,485 |  |  |
Securities available for sale, fair value, total other securities | $ 11,573 |  | $ 12,485 |  |  |

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