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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
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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