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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 45,792
Due after one through five years	133,474
Due after five through ten years	66,356
Due after ten years	133,631
Amortized cost	597,020	$ 590,199
Available-for-sale, fair value [Abstract]
Due in one year or less	45,586
Due after one through five years	131,738
Due after five through ten years	65,169
Due after ten years	131,769
Total securities	585,764	585,761
Held-to-maturity, amortized cost [Abstract]
Due in one year or less	0
Due after one through five years	659
Due after five through ten years	0
Due after ten years	0
Amortized cost	659	659
Held-to-maturity, fair value [Abstract]
Due in one year or less	0
Due after one through five years	660
Due after five through ten years	0
Due after ten years	0
Total debt securities	660	$ 660
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	217,260
Available-for-sale, fair value [Abstract]
Without single maturity date	211,000
Held-to-maturity, amortized cost [Abstract]
Without single maturity date	0
Held-to-maturity, fair value [Abstract]
Without single maturity date	0
Other Debt Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	507
Available-for-sale, fair value [Abstract]
Without single maturity date	502
Held-to-maturity, amortized cost [Abstract]
Without single maturity date	0
Held-to-maturity, fair value [Abstract]
Without single maturity date	$ 0

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