Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified		Total	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Deferred Benefits for Directors
Beginning, Balance at Dec. 31, 2010		$ 606,863	$ 55,487	$ 191,987	$ 361,513	$ (1,063)	$ 131	$ (1,192)
Beginning Balance, shares at Dec. 31, 2010			26,586,953
Net income		22,159			22,159
Other comprehensive income:
Unrealized loss on available-for-sale securities		2,010					2,010
Amortization of unrealized gain on transferred securities		(751)					(751)
Defined benefit pension plan		485					485
Comprehensive income		23,903
Common dividends declared ($0.34 per share for December 31,2011 and $0.30 per share for December 31,2010)		(7,983)			(7,983)
Stock options exercised		26		(13)		39
Stock options exercised, shares			1,775
Restricted stock granted				(928)		928
Restricted stock granted, shares			40,632
Stock compensation expense		228		228
Deferred benefits for directors- net				(11)				11
Ending, Balance at Jun. 30, 2011		623,037	55,487	191,263	375,689	(96)	1,875	(1,181)
Ending Balance, shares at Jun. 30, 2011			26,629,360
Beginning, Balance at Dec. 31, 2011		633,790	55,487	191,679	388,818	(96)	(902)	(1,196)
Beginning Balance, shares at Dec. 31, 2011			26,629,360
Net income		23,988			23,988
Other comprehensive income:
Unrealized loss on available-for-sale securities		(103)					(103)
Amortization of unrealized gain on transferred securities		(512)					(512)
Defined benefit pension plan		674					674
Comprehensive income		24,047
Common dividends declared ($0.34 per share for December 31,2011 and $0.30 per share for December 31,2010)		(9,060)			(9,060)
Restricted stock granted	[1]		71	(198)	127
Restricted stock granted, shares	[1]		40,050
Treasury shares acquired		(70)		22		(92)
Treasury shares acquired, shares			(4,766)
Stock compensation expense		405		405
Deferred benefits for directors- net				18				(18)
Ending, Balance at Jun. 30, 2012		$ 649,112	$ 55,558	$ 191,926	$ 403,746	$ (61)	$ (843)	$ (1,214)
Ending Balance, shares at Jun. 30, 2012			26,664,644

[1] An additional 33,891 common shares were issued resulting from the restricted stock grant.