Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2012	$ 7,847	$ 57,211	$ 90,591	$ 7,597	$ 163,246
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	12,604	0	12,604
Other comprehensive loss	0	0	0	(5,324)	(5,324)
Stock options exercised	17	292	0	0	309
Equity based compensation	22	402	0	0	424
Cash dividends declared	0	0	(5,433)	0	(5,433)
Balance at Sep. 30, 2013	7,886	57,905	97,762	2,273	165,826
Balance at Dec. 31, 2013	7,891	58,050	99,090	2,520	167,551
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock repurchased and retired	(70)	(1,438)	0	0	(1,508)
Cash dividends declared	0	0	(5,426)	0	(5,426)
Balance at Jun. 30, 2014
Balance at Dec. 31, 2013	7,891	58,050	99,090	2,520	167,551
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	9,851	0	9,851
Other comprehensive loss	0	0	0	2,200	2,200
Stock options exercised	0	0	0	0	0
Equity based compensation	22	475	0	0	497
Balance at Sep. 30, 2014	$ 7,843	$ 57,087	$ 103,515	$ 4,720	$ 173,165