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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Securities held-to-maturity, amortized cost, due in one year or less	$ 180
Securities held-to-maturity, fair value, due in one year or less	180
Securities held-to-maturity, amortized cost, due after ten years	50,774
Securities held-to-maturity, fair value, due after ten years	53,818
Securities held-to-maturity, amortized cost	58,888	$ 32,018
Securities held-to-maturity, fair value	62,112	29,874
Securities available for sale, amortized cost, due after one years through five years	10,000
Securities available for sale, fair value, due after one years through five years	9,820
Securities available for sale, amortized cost, due after five years through ten years	137,918
Securities available for sale, fair value, due after five years through ten years	131,051
Securities available for sale, amortized cost, due after ten years	96,560
Securities available for sale, fair value, due after ten years	95,564
Securities available for sale, amortized cost, total other securities	778,294	845,332
Securities available for sale, fair value, total other securities	772,500	822,655
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,954	24,065
Securities held-to-maturity, fair value	53,998	22,508
Securities available for sale, fair value, total other securities	248,651	264,702
Total Other Securities [Member]
Securities available for sale, amortized cost, total other securities	244,478
Securities available for sale, fair value, total other securities	236,435
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,934	7,953
Securities held-to-maturity, fair value	8,114	7,366
Securities available for sale, amortized cost, total other securities	521,600	567,863
Securities available for sale, fair value, total other securities	523,849	557,953
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,216	11,586
Securities available for sale, fair value, total other securities	$ 12,216	$ 11,586

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