Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total		Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2013	$ 167,551		$ 7,891	$ 58,050	$ 99,090	$ 2,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,851				9,851
Other comprehensive income (loss)	2,200					2,200
Stock repurchased and retired	(1,508)		(70)	(1,438)
Equity based compensation	497		22	475
Cash dividends declared ($0.46 per share)	(5,426)				(5,426)
Ending Balance at Sep. 30, 2014	173,165		7,843	57,087	103,515	4,720
Beginning Balance at Dec. 31, 2014	173,780	[1]	7,872	57,650	104,594	3,664
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,432				10,432
Other comprehensive income (loss)	(378)					(378)
Issuance of common stock	20,483		826	19,657
Stock repurchased and retired	(2,808)		(122)	(2,686)
Stock options exercised	399		22	377
Equity based compensation	539		13	526
Cash dividends declared ($0.46 per share)	(5,996)				(5,996)
Ending Balance at Sep. 30, 2015	$ 196,451		$ 8,611	$ 75,524	$ 109,030	$ 3,286

[1] Derived from audited consolidated financial statements.