Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale Securities [Abstract]
Amortized cost	$ 530,847	$ 499,893
Gross Unrealized Gains	1,136	272
Gross Unrealized Losses	(11,601)	(18,820)
Fair Value	520,382	481,345
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	31,222	22,750
Held-to-maturity securities, Gross Unrealized Gains	194	80
Held-to-maturity securities, Gross Unrealized Losses	(148)	(412)
Held-to-maturity, at fair value	31,268	22,418
U.S. Government-sponsored agencies
Available-for-sale Securities [Abstract]
Amortized cost	102,749	109,631
Gross Unrealized Gains	41	20
Gross Unrealized Losses	(1,918)	(2,066)
Fair Value	100,872	107,585
Municipal securities
Available-for-sale Securities [Abstract]
Amortized cost	96,328	97,090
Gross Unrealized Gains	388	90
Gross Unrealized Losses	(1,271)	(4,674)
Fair Value	95,445	92,506
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	10,150	10,157
Held-to-maturity securities, Gross Unrealized Gains	27	0
Held-to-maturity securities, Gross Unrealized Losses	(115)	(356)
Held-to-maturity, at fair value	10,062	9,801
Mortgage-backed securities
Available-for-sale Securities [Abstract]
Amortized cost	288,120	251,492
Gross Unrealized Gains	674	162
Gross Unrealized Losses	(6,023)	(8,742)
Fair Value	282,771	242,912
Asset-backed securities
Available-for-sale Securities [Abstract]
Amortized cost	5,000	5,002
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(72)	(143)
Fair Value	4,928	4,859
Corporate securities
Available-for-sale Securities [Abstract]
Amortized cost	38,650	36,678
Gross Unrealized Gains	33	0
Gross Unrealized Losses	(2,317)	(3,195)
Fair Value	36,366	33,483
Held-to-maturity Securities [Abstract]
Held-to-maturity securities, amortized cost	21,072	12,593
Held-to-maturity securities, Gross Unrealized Gains	167	80
Held-to-maturity securities, Gross Unrealized Losses	(33)	(56)
Held-to-maturity, at fair value	$ 21,206	$ 12,617