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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt securities, available for sale, amortized cost [Abstract]
Due in one year or less	$ 65,507
Due after one through five years	93,465
Due after five through ten years	84,350
Due after ten years	102,316
Amortized cost	602,114	$ 565,199
Debt securities, available for sale, fair value [Abstract]
Due in one year or less	65,393
Due after one through five years	92,943
Due after five through ten years	83,231
Due after ten years	100,859
Fair value	593,746	561,403
Debt securities, held to maturity, amortized cost [Abstract]
Due in one year or less	0
Due after one through five years	649
Due after five through ten years	0
Due after ten years	0
Amortized cost	649	659
Debt securities, held to maturity, fair value [Abstract]
Due in one year or less	0
Due after one through five years	649
Due after five through ten years	0
Due after ten years	0
Fair value	649	660
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Debt securities, available for sale, amortized cost [Abstract]
Without single maturity date	255,969
Amortized cost	255,969	208,959
Debt securities, available for sale, fair value [Abstract]
Without single maturity date	250,819
Fair value	250,819	205,309
Debt securities, held to maturity, amortized cost [Abstract]
Without single maturity date	0
Debt securities, held to maturity, fair value [Abstract]
Without single maturity date	0
Other Debt Obligations [Member]
Debt securities, available for sale, amortized cost [Abstract]
Without single maturity date	507
Amortized cost	507	507
Debt securities, available for sale, fair value [Abstract]
Without single maturity date	501
Fair value	501	$ 507
Debt securities, held to maturity, amortized cost [Abstract]
Without single maturity date	0
Debt securities, held to maturity, fair value [Abstract]
Without single maturity date	$ 0

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