Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net interest income		$ 8,477	$ 8,348	$ 8,083	$ 7,298	$ 7,016	$ 6,879	$ 6,742	$ 7,168	$ 32,206	$ 27,805	$ 27,940
Provision for loan losses (recovery) (Note 4)		1,219	238	207	52	139	115	235	(546)	1,716	(57)	353
Net interest income after provision for loan losses		7,258	8,110	7,876	7,246	6,877	6,764	6,507	7,714	30,490	27,862	27,587
Non-interest income		694	768	884	758	582	637	671	541	3,104	2,431	2,462
Non-interest expense		8,736	13,730	6,995	7,096	7,061	6,880	6,965	6,957	36,557	27,863	26,216
Income (loss) before income taxes		(784)	(4,852)	1,765	908	398	521	213	1,298	(2,963)	2,430	3,833
Income tax (benefit)		2,081	(1,643)	641	345	159	239	117	490	1,424	1,005	1,315
Net income (loss)	$ (2,864)	$ (2,865)	$ (3,209)	$ 1,124	$ 563	$ 239	$ 282	$ 96	$ 808	$ (4,387)	$ 1,425	$ 2,518
Basic earnings per share	$ (0.16)	$ (0.16)								$ (0.16)
Diluted earnings per share	$ (0.16)	$ (0.16)								$ (0.16)
Weighted average common shares (basic and diluted)		17,739,796