Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 82,872
Due after one through five years	20,033
Due after five through ten years	91,340
Due after ten years	61,125
Amortized cost	625,914	$ 593,945
Available for sale, fair value [Abstract]
Due in one year or less	83,574
Due after one through five years	20,371
Due after five through ten years	91,659
Due after ten years	63,463
Fair value	633,479	599,844
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	313,979
Amortized cost	313,979	291,874
Available for sale, fair value [Abstract]
Without single maturity date	321,043
Fair value	321,043	295,245
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	56,565
Amortized cost	56,565	31,418
Available for sale, fair value [Abstract]
Without single maturity date	53,369
Fair value	$ 53,369	$ 31,142

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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