Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2015	$ 24,795	$ 16,392	$ 55,151	$ (3,162)	$ 93,176
Beginning Balance (in shares) at Dec. 31, 2015	4,959,009
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	1,021	0	1,021
Total change in other comprehensive income or (loss), net of tax	0	0	0	515	515
Stock Issued During Period, Value, Stock Options Exercised	$ 0	0	0	0	$ 0
Exercise of stock options (in shares)	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans					0
Stock Repurchased and Retired During Period, Value	$ 0	0	0	0	$ 0
Stock Repurchased and Retired During Period, Shares	0
Cash dividends	$ 0	0	(496)	0	(496)
Ending Balance at Mar. 31, 2016	$ 24,795	16,392	55,676	(2,647)	94,216
Ending Balance (in shares) at Mar. 31, 2016	4,959,009
Beginning Balance at Dec. 31, 2016	$ 24,806	16,427	56,965	(4,208)	$ 93,990
Beginning Balance (in shares) at Dec. 31, 2016	4,961,258				4,961,258
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	942	0	$ 942
Total change in other comprehensive income or (loss), net of tax	0	0	0	428	428
Stock Issued During Period, Value, Stock Options Exercised	$ 90	271	0	0	$ 361
Exercise of stock options (in shares)	18,006				(18,006)
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 4	17	0	0	$ 21
Stock Issued During Period, Shares, Employee Stock Purchase Plans	773				773
Stock Repurchased and Retired During Period, Value	$ (14)	(60)	0	0	$ (74)
Stock Repurchased and Retired During Period, Shares	(2,770)
Cash dividends	$ 0	0	(547)	0	(547)
Ending Balance at Mar. 31, 2017	$ 24,886	$ 16,655	$ 57,360	$ (3,780)	$ 95,121
Ending Balance (in shares) at Mar. 31, 2017	4,977,267				4,977,267