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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-sale, amortized cost [Abstract]
Due in one year or less	$ 34,370
Due after one through five years	88,607
Due after five through ten years	94,121
Due after ten years	77,871
Amortized cost	643,164	$ 602,114
Available for sale, fair value [Abstract]
Due in one year or less	34,394
Due after one through five years	89,169
Due after five through ten years	94,255
Due after ten years	80,251
Fair value	649,976	593,746
Held-to-maturity, amortized cost [Abstract]
Due in one year or less	517
Due after one through five years	0
Due after five through ten years	0
Due after ten years	0
Amortized cost	517	649
Held-to-maturity, fair value [Abstract]
Due in one year or less	517
Due after one through five years	0
Due after five through ten years	0
Due after ten years	0
Fair value	517	649
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale, amortized cost [Abstract]
Without single maturity date	316,745
Amortized cost	316,745	255,969
Available for sale, fair value [Abstract]
Without single maturity date	320,463
Fair value	320,463	250,819
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	31,450
Amortized cost	31,450	507
Available for sale, fair value [Abstract]
Without single maturity date	31,444
Fair value	31,444	$ 501
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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