Securities - Related Gross Unrealized Gains and Losses and Amortized Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 157,277	$ 167,612
Gross Unrealized Gains	493	446
Gross Unrealized Losses	(1,468)	(2,131)
Securities available-for-sale	156,302	165,927
U.S. government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,680	12,680
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(487)	(609)
Securities available-for-sale	12,193	12,071
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,120	9,127
Gross Unrealized Gains	3	2
Gross Unrealized Losses	(25)	(64)
Securities available-for-sale	9,098	9,065
U.S. government agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	119,082	128,550
Gross Unrealized Gains	134	90
Gross Unrealized Losses	(862)	(1,327)
Securities available-for-sale	118,354	127,313
Collateralized residential mortgage obligations: Agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	13,692	14,566
Gross Unrealized Gains	8	0
Gross Unrealized Losses	(73)	(110)
Securities available-for-sale	13,627	14,456
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,703	2,689
Gross Unrealized Gains	348	354
Gross Unrealized Losses	(21)	(21)
Securities available-for-sale	$ 3,030	$ 3,022