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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 12,136
Due after one through five years	19,933
Due after five through ten years	95,400
Due after ten years	82,060
Amortized cost	725,392	$ 593,945
Available for sale, fair value [Abstract]
Due in one year or less	12,195
Due after one through five years	20,503
Due after five through ten years	96,332
Due after ten years	86,320
Fair value	740,479	599,844
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	459,327
Amortized cost	459,327	291,874
Available for sale, fair value [Abstract]
Without single maturity date	469,955
Fair value	469,955	295,245
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	56,536
Amortized cost	56,536	31,418
Available for sale, fair value [Abstract]
Without single maturity date	55,174
Fair value	$ 55,174	$ 31,142

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