Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2016		$ 93,567	$ 2,235	$ 17,418	$ 80,147	$ (3,757)	$ (2,476)
Balance (in shares) at Dec. 31, 2016			3,411,701
Net income		5,246			5,246
Other comprehensive loss, net of tax		1,364				1,364
Cash dividends declared		(2,122)			(2,122)
Stock issued in connection with dividend reinvestment and stock purchase plan		512	$ 9	503
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)			13,579
Stock issued for employee stock purchase plan		42	$ 1	41
Stock issued for employee stock purchase (in shares)			1,318
Stock issued for options exercised		$ 90	$ 4	86
Stock issued for options exercised (in shares)		10,675	6,642
Stock-based compensation expense		$ 51		51
Balance at Jun. 30, 2017		98,750	$ 2,249	18,099	83,271	(2,393)	(2,476)
Balance (in shares) at Jun. 30, 2017			3,433,240
Balance at Dec. 31, 2017		$ 98,570	$ 2,258	18,691	84,183	(4,086)	(2,476)
Balance (in shares) at Dec. 31, 2017		3,448,108	3,448,108
Net income		$ 5,797			5,797
Other comprehensive loss, net of tax		(4,950)				(4,950)
Cash dividends declared		(2,212)			(2,212)
Equity securities fair value reclassification	[1]				(254)	254
ASU 2018-02 stranded tax reclassification	[2]				805	(805)
Stock issued in connection with dividend reinvestment and stock purchase plan		429	$ 6	423
Stock issued in connection with dividend reinvestment and stock purchase plan (in shares)			9,934
Stock issued for employee stock purchase plan		57	$ 1	56
Stock issued for employee stock purchase (in shares)			1,426
Stock issued for options exercised		$ 69	$ 4	65
Stock issued for options exercised (in shares)		10,000	6,000
Stock-based compensation expense		$ 58		58
Balance at Jun. 30, 2018		$ 97,818	$ 2,269	$ 19,293	$ 88,319	$ (9,587)	$ (2,476)
Balance (in shares) at Jun. 30, 2018		3,465,468	3,465,468

[1] Refer to Note 2, ASU 2016-01

[2] Refer to Note 2, ASU 2018-02