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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Securities held-to-maturity, amortized cost, due after ten years	$ 50,627
Securities held-to-maturity, fair value, due after ten years	51,938
Securities held-to-maturity, amortized cost	58,556	$ 58,888
Securities held-to-maturity, fair value	60,891	62,112
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	18,276
Securities available for sale, amortized cost, due after five years through ten years	127,923
Securities available for sale, fair value, due after five years through ten years	109,510
Securities available for sale, amortized cost, due after ten years	96,536
Securities available for sale, fair value, due after ten years	85,594
Securities available for sale, amortized cost, total other securities	736,013	778,294
Securities available for sale, fair value, total other securities	715,412	772,500
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,627	50,954
Securities held-to-maturity, fair value	51,938	53,998
Securities available for sale, fair value, total other securities	225,856	248,651
Total Other Securities [Member]
Securities available for sale, amortized cost, total other securities	244,459
Securities available for sale, fair value, total other securities	213,380
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,929	7,934
Securities held-to-maturity, fair value	8,953	8,114
Securities available for sale, amortized cost, total other securities	479,078	521,600
Securities available for sale, fair value, total other securities	489,556	523,849
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,476	12,216
Securities available for sale, fair value, total other securities	$ 12,476	$ 12,216

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