Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) $ in Thousands	USD ($) $ / shares
Balance at beginning of period at Dec. 31, 2015	$ 61,266
Statement of Stockholders' Equity [Abstract]
Net income	4,785
Other comprehensive income (loss)	1,284
Stock options exercised	7
Cash dividends declared	(1,591)
Balance at end of period at Sep. 30, 2016	$ 65,751
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share | $ / shares	$ 0.58
Balance at beginning of period at Jun. 30, 2016	$ 64,407
Statement of Stockholders' Equity [Abstract]
Net income	1,694
Other comprehensive income (loss)	199
Cash dividends declared	(549)
Balance at end of period at Sep. 30, 2016	$ 65,751
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share | $ / shares	$ 0.20
Balance at beginning of period at Dec. 31, 2016	$ 65,415
Statement of Stockholders' Equity [Abstract]
Net income	5,322
Other comprehensive income (loss)	802
Cash dividends declared	(1,701)
Balance at end of period at Sep. 30, 2017	$ 69,838
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share | $ / shares	$ 0.62
Balance at beginning of period at Jun. 30, 2017	$ 68,726
Statement of Stockholders' Equity [Abstract]
Net income	1,866
Other comprehensive income (loss)	(150)
Cash dividends declared	(604)
Balance at end of period at Sep. 30, 2017	$ 69,838
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per share | $ / shares	$ 0.22