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Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale Securities [Abstract]
Amortized cost	$ 491,726	$ 481,357
Gross Unrealized Gains	133	1,024
Gross Unrealized Losses	(22,862)	(9,106)
Fair Value	468,997	473,275
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	20,200	19,209
Held-to-maturity securities, Gross Unrealized Gains	24	231
Held-to-maturity securities, Gross Unrealized Losses	(714)	(357)
Held-to-maturity, at fair value	19,510	19,083
U.S. Government-sponsored agencies
Available-for-sale Securities [Abstract]
Amortized cost	115,176	133,424
Gross Unrealized Gains	20	531
Gross Unrealized Losses	(2,436)	(765)
Fair Value	112,760	133,190
Municipal securities
Available-for-sale Securities [Abstract]
Amortized cost	97,160	97,370
Gross Unrealized Gains	39	366
Gross Unrealized Losses	(6,119)	(1,359)
Fair Value	91,080	96,377
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	10,159	10,164
Held-to-maturity securities, Gross Unrealized Gains	0	40
Held-to-maturity securities, Gross Unrealized Losses	(640)	(357)
Held-to-maturity, at fair value	9,519	9,847
Mortgage-backed securities
Available-for-sale Securities [Abstract]
Amortized cost	237,703	215,452
Gross Unrealized Gains	33	15
Gross Unrealized Losses	(12,044)	(5,747)
Fair Value	225,692	209,720
Asset-backed securities
Available-for-sale Securities [Abstract]
Amortized cost	5,003	5,000
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(43)	0
Fair Value	4,960	5,009
Corporate securities
Available-for-sale Securities [Abstract]
Amortized cost	36,684	27,111
Gross Unrealized Gains	41	103
Gross Unrealized Losses	(2,220)	(1,167)
Fair Value	34,505	26,047
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	10,041	9,045
Held-to-maturity securities, Gross Unrealized Gains	24	191
Held-to-maturity securities, Gross Unrealized Losses	(74)	0
Held-to-maturity, at fair value	$ 9,991	9,236
Other securities
Available-for-sale Securities [Abstract]
Amortized cost		3,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(68)
Fair Value		$ 2,932

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