Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total		Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2015	$ 197,835		$ 8,605	$ 75,375	$ 111,565	$ 2,290
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,216				8,216
Other comprehensive income	1,441					1,441
Stock repurchased	(1,203)		(48)	(1,155)
Stock options exercised	101		4	97
Vesting of restricted stock			3	(3)
Equity based compensation	447		8	439
Cash dividends paid	(4,133)				(4,133)
Ending Balance at Jun. 30, 2016	202,704		8,572	74,753	115,648	3,731
Beginning Balance at Mar. 31, 2016						3,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,088
Other comprehensive income	235
Ending Balance at Jun. 30, 2016	202,704		8,572	74,753	115,648	3,731
Beginning Balance at Dec. 31, 2016	201,380	[1]	8,578	75,076	119,600	(1,874)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,342				8,342
Other comprehensive income	846					846
Stock options exercised	73		3	70
Vesting of restricted stock			7	(7)
Equity based compensation	559		7	552
Cash dividends paid	(4,147)				(4,147)
Ending Balance at Jun. 30, 2017	207,053		8,595	75,691	123,795	(1,028)
Beginning Balance at Mar. 31, 2017						(1,385)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,279
Other comprehensive income	357
Ending Balance at Jun. 30, 2017	$ 207,053		$ 8,595	$ 75,691	$ 123,795	$ (1,028)

[1] Derived from audited consolidated financial statements.