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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Securities held-to-maturity, amortized cost, due after ten years | $ 50,827 |
Securities held-to-maturity, fair value, due after ten years | 52,543 |
Securities held-to-maturity, amortized cost | 58,736 |
Securities held-to-maturity, allowance for credit losses | (915) | $ (907)
Securities held-to-maturity, amortized cost | 57,821 | 57,832
Securities held-to-maturity, fair value | 61,035 | 63,529
Securities available for sale, amortized cost, due after one years through five years | 45,000 |
Securities available for sale, fair value, due after one years through five years | 45,181 |
Securities available for sale, amortized cost, due after five years through ten years | 152,453 |
Securities available for sale, fair value, due after five years through ten years | 151,553 |
Securities available for sale, amortized cost, due after ten years | 33,262 |
Securities available for sale, fair value, due after ten years | 33,181 |
Securities available for sale, amortized cost, total other securities | 762,561 | 646,112
Securities available for sale, fair value, total other securities | 761,221 | 647,974
US States and Political Subdivisions Debt Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,827 | 50,825
Securities held-to-maturity, fair value | 52,543 | 54,538
Total Other Securities [Member] |  |
Securities held-to-maturity, amortized cost | 50,827 |
Securities held-to-maturity, fair value | 52,543 |
Securities available for sale, amortized cost, total other securities | 230,715 |
Securities available for sale, fair value, total other securities | 229,915 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, amortized cost | 7,909 | 7,914
Securities held-to-maturity, amortized cost | 7,909 | 7,914
Securities held-to-maturity, fair value | 8,492 | 8,991
Securities available for sale, amortized cost, total other securities | 519,321 | 395,101
Securities available for sale, fair value, total other securities | 518,781 | 404,460
Mutual Fund Debt Securities [Member] |  |
Securities available for sale, amortized cost, total other securities | 12,525 | 12,703
Securities available for sale, fair value, total other securities | $ 12,525 | $ 12,703

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