Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Shares Outstanding	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2009	$ 293,678	$ 3,463	$ (57,564)	$ 346,297	$ 2,294	$ (812)
Beginning balance, shares at Dec. 31, 2009		16,016,738
Net Income (loss)	(2,029)				(2,029)
Stock option expense/Grants and exercises of stock options, net of tax, shares		12,426
Stock option/Grants expense and exercises of stock options, net of tax	319	2		317
Cash dividends ($0.50 and $0.51 per share for 2011 and 2010)	(8,976)				(8,976)
Accrued benefit liability adjustment	184					184
Net unrealized gain on securities available for sale:
Not other-than-temporarily impaired	4,761					4,761
Other-than-temporarily impaired (includes $1,318 of total losses less $323 of losses recognized in earnings, net of $408 tax) for 2011 and (includes $2,841 of total losses less $2,358 of losses recognized in earnings, net of $198 tax) for 2010	(285)					(285)
Ending balance at Sep. 30, 2010	287,652	3,465	(57,564)	346,614	(8,711)	3,848
Ending balance, shares at Sep. 30, 2010		16,029,164
Beginning balance at Dec. 31, 2010	289,917	3,793	(57,564)	346,750	(3,989)	927
Beginning balance, shares at Dec. 31, 2010	17,665,908	17,665,908
Net Income (loss)	20,764				20,764
Stock option expense/Grants and exercises of stock options, net of tax, shares		28,389
Stock option/Grants expense and exercises of stock options, net of tax	593	6		587
Cash dividends ($0.50 and $0.51 per share for 2011 and 2010)	(8,844)				(8,844)
Accrued benefit liability adjustment	46					46
Net unrealized gain on securities available for sale:
Not other-than-temporarily impaired	1,622					1,622
Other-than-temporarily impaired (includes $1,318 of total losses less $323 of losses recognized in earnings, net of $408 tax) for 2011 and (includes $2,841 of total losses less $2,358 of losses recognized in earnings, net of $198 tax) for 2010	(587)					(587)
Ending balance at Sep. 30, 2011	$ 303,511	$ 3,799	$ (57,564)	$ 347,337	$ 7,931	$ 2,008
Ending balance, shares at Sep. 30, 2011	17,694,297	17,694,297