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Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Securities held-to-maturity, amortized cost, due after ten years	$ 50,654
Securities held-to-maturity, fair value, due after ten years	53,268
Securities held-to-maturity, amortized cost	58,573	$ 58,888
Securities held-to-maturity, fair value	62,466	62,112
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	43,654
Securities available for sale, amortized cost, due after five years through ten years	110,431
Securities available for sale, fair value, due after five years through ten years	104,599
Securities available for sale, amortized cost, due after ten years	76,256
Securities available for sale, fair value, due after ten years	73,777
Securities available for sale, amortized cost, total other securities	620,262	778,294
Securities available for sale, fair value, total other securities	620,956	772,500
Other Debt Obligations [Member]
Securities held-to-maturity, amortized cost	50,654	50,954
Securities held-to-maturity, fair value	53,268	53,998
Securities available for sale, fair value, total other securities	234,721	248,651
Total Other Securities [Member]
Securities available for sale, amortized cost, total other securities	231,687
Securities available for sale, fair value, total other securities	222,030
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, amortized cost	7,919	7,934
Securities held-to-maturity, fair value	9,198	8,114
Securities available for sale, amortized cost, total other securities	375,884	521,600
Securities available for sale, fair value, total other securities	386,235	523,849
Mutual Fund Debt Securities [Member]
Securities available for sale, amortized cost, total other securities	12,691	12,216
Securities available for sale, fair value, total other securities	$ 12,691	$ 12,216

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