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, 2010	$ 6,128	$ 27,268	$ 74,850	$ (159)	$ 108,087
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	2,790	0	2,790
Other comprehensive income	0	0	0	2,712	2,712
Stock options exercised	11	162	0	0	173
Stock option expense	0	32	0	0	32
Equity based compensation	18	208	0	0	226
Cash dividends declared	0		(2,830)	0	(2,830)
Balance at Jun. 30, 2011	6,157	27,670	74,810	2,553	111,190
Balance at Dec. 31, 2011	7,807	56,395	81,797	6,830	152,829
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	0	0	8,449	0	8,449
Other comprehensive income	0	0	0	291	291
Stock options exercised	3	42	0	0	45
Equity based compensation	26	388	0	0	414
Cash dividends declared	0		(3,604)	0	(3,604)
Balance at Jun. 30, 2012	$ 7,836	$ 56,825	$ 86,642	$ 7,121	$ 158,424