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, 2017	$ 208,717		$ 8,604	$ 76,179	$ 127,010	$ (3,076)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,812				5,812
Other comprehensive income (loss)	(2,879)					(2,879)
Stock options exercised	85		3	82
Vesting of restricted stock	0		10	(10)
Equity based compensation	278		4	274
Cash dividends paid	(2,173)				(2,173)
Ending Balance at Mar. 31, 2018	209,840		8,621	76,525	131,299	(6,605)
Beginning Balance at Dec. 31, 2018	222,542	[1]	8,668	78,172	141,537	(5,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,003				6,003
Other comprehensive income (loss)	2,514					2,514
Stock options exercised	290		13	277
Vesting of restricted stock	0		20	(20)
Equity based compensation	313		4	309
Cash dividends paid	(2,189)				(2,189)
Ending Balance at Mar. 31, 2019	$ 229,473		$ 8,705	$ 78,738	$ 145,351	$ (3,321)

[1] Derived from audited consolidated financial statements.