Securities - Related Gross Unrealized Gains and Losses and Amortized Cost (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 167,612	$ 172,480
Gross Unrealized Gains	446	194
Gross Unrealized Losses	(2,131)	(1,234)
Securities available-for-sale	165,927	171,440
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,680	14,629
Gross Unrealized Gains	0	13
Gross Unrealized Losses	(609)	(35)
Securities available-for-sale	12,071	14,607
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,127	10,190
Gross Unrealized Gains	2	16
Gross Unrealized Losses	(64)	(25)
Securities available-for-sale	9,065	10,181
U.S. government agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	128,550	127,039
Gross Unrealized Gains	90	7
Gross Unrealized Losses	(1,327)	(1,017)
Securities available-for-sale	127,313	126,029
Collateralized residential mortgage obligations: Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,566	17,990
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(110)	(157)
Securities available-for-sale	14,456	17,833
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,689	2,632
Gross Unrealized Gains	354	158
Gross Unrealized Losses	(21)	0
Securities available-for-sale	$ 3,022	$ 2,790