Condensed Financial Statements of Parent Company, Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income [Abstract]
Other income	$ 155	$ 113	$ 133
Total interest and dividend income	32,934	29,826	30,295
Expenses [Abstract]
Salaries and benefits	20,863	19,878	20,747
Legal expenses	2,069	2,122	1,413
Other operating expenses	2,768	2,640	2,668
Total noninterest expense	39,946	34,831	35,086
Income (loss) before income taxes	(126)	3,957	3,688
Income tax benefit	(97)	160	54
Net income (loss)	(29)	3,797	3,634
Parent Company [Member]
Income [Abstract]
Dividends from subsidiaries	2,050	2,900	2,900
Other income	200	200	200
Total interest and dividend income	2,250	3,100	3,100
Expenses [Abstract]
Salaries and benefits	445	406	432
Legal expenses	285	774	180
Service fees	210	166	137
Other operating expenses	316	55	19
Total noninterest expense	1,256	1,401	768
Income (loss) before income taxes	994	1,699	2,332
Income tax benefit	(360)	(408)	(193)
Net income before equity in undistributed net income of subsidiaries	1,354	2,107	2,525
Equity in undistributed net income (loss) of subsidiaries	(1,383)	1,690	1,109
Net income (loss)	$ (29)	$ 3,797	$ 3,634