Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balances at Dec. 31, 2011	$ 8,675	$ 133,945	$ (1,321)	$ 141,299
Net income		13,062		13,062
Dividends		(3,678)		(3,678)
Stock options exercised	5	54		59
Other comprehensive income (loss), net of tax			(344)	(344)
Ending Balances at Sep. 30, 2012	8,680	143,383	(1,665)	150,398
Beginning Balances at Dec. 31, 2012	8,685	144,162	(2,738)	150,109
Net income		13,168		13,168
Dividends		(3,752)		(3,752)
Other comprehensive income (loss), net of tax			(13,231)	(13,231)
Ending Balances at Sep. 30, 2013	$ 8,685	$ 153,578	$ (15,969)	$ 146,294