Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2015	16,514,245
Beginning balance at Dec. 31, 2015	$ 20,643	$ 62,059	$ 3,714	$ (61)	$ 86,355
Net income for the period			4,785		4,785
Cash dividends			(993)		(993)
Common shares issued under long-term incentive compensation plan (in shares)	52,848
Common shares issued under long-term incentive compensation plan	$ 66	(66)
Restricted stock awards		195			195
Common shares issued through dividend reinvestment / optional cash purchase plan (in shares)	47,763
Common shares issued through dividend reinvestment / optional cash purchase plan	$ 59	193			252
Other comprehensive income, net of tax				6,293	6,293
Balance (in shares) at Sep. 30, 2016	16,614,856
Ending balance at Sep. 30, 2016	$ 20,768	62,381	7,506	6,232	96,887
Beginning balance at Jun. 30, 2016				7,023
Net income for the period					2,017
Other comprehensive income, net of tax				(791)	(791)
Balance (in shares) at Sep. 30, 2016	16,614,856
Ending balance at Sep. 30, 2016	$ 20,768	62,381	7,506	6,232	96,887
Balance (in shares) at Dec. 31, 2016	16,645,845
Beginning balance at Dec. 31, 2016	$ 20,807	62,593	8,531	(1,560)	90,371
Net income for the period			6,261		6,261
Cash dividends			(1,505)		(1,505)
Common shares issued under long-term incentive compensation plan (in shares)	46,878
Common shares issued under long-term incentive compensation plan	$ 58	(58)
Restricted stock awards		234			234
Common shares issued through dividend reinvestment / optional cash purchase plan (in shares)	65,240
Common shares issued through dividend reinvestment / optional cash purchase plan	$ 82	374	(5)		451
Other comprehensive income, net of tax				1,670	1,670
Balance (in shares) at Sep. 30, 2017	16,757,963
Ending balance at Sep. 30, 2017	$ 20,947	63,143	13,282	110	97,482
Beginning balance at Jun. 30, 2017				1,196
Net income for the period					2,272
Other comprehensive income, net of tax				(1,086)	(1,093)
Balance (in shares) at Sep. 30, 2017	16,757,963
Ending balance at Sep. 30, 2017	$ 20,947	$ 63,143	$ 13,282	$ 110	$ 97,482