CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS	TREASURY STOCK
Beginning Balance (in shares) at Dec. 31, 2014		5,002,649
Beginning Balance at Dec. 31, 2014	$ 135,967	$ 41,688	$ 49,896	$ 53,107	$ (1,667)	$ (7,057)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,788			6,788
Other comprehensive loss	(1,503)				(1,503)
Dividends declared	(4,498)			(4,498)
Common shares issued for employee stock purchase plan (in shares)		1,108
Common shares issued for employee stock purchase plan	47	$ 10	37
Purchases of treasury stock	(1,803)					(1,803)
Ending Balance (in shares) at Jun. 30, 2015		5,003,757
Ending Balance at Jun. 30, 2015	134,998	$ 41,698	49,933	55,397	(3,170)	(8,860)
Beginning Balance (in shares) at Dec. 31, 2015		5,004,984
Beginning Balance at Dec. 31, 2015	136,279	$ 41,708	49,992	58,038	(3,799)	(9,660)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,468			6,468
Other comprehensive loss	1,631				1,631
Dividends declared	(4,452)			(4,452)
Common shares issued for employee stock purchase plan (in shares)		1,052
Common shares issued for employee stock purchase plan	42	$ 9	33
Purchases of treasury stock	(574)					(574)
Ending Balance (in shares) at Jun. 30, 2016		5,006,036
Ending Balance at Jun. 30, 2016	$ 139,394	$ 41,717	$ 50,025	$ 60,054	$ (2,168)	$ (10,234)