Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands		Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Comprehensive Income [Member]	Total
Balance at Dec. 31, 2009		$ 87,182	$ 746,775	$ 30,235	$ (20,366)		$ 843,826
Comprehensive income
Net income		0	0	20,592	0	20,592	20,592
Other comprehensive income
Change in unrealized gain (loss) on securities available for sale, net of reclassification and tax	[1]	0	0	0	15,004	15,004	15,004
Transferred securities, net of tax	[1]	0	0	0	5,360	5,360	5,360
Reclassification adjustment on cash flows hedges, net of tax	[1]	0	0	0	681	681	681
Net loss, settlement cost and amortization of net (gain) loss on defined benefit pension plans, net of tax	[1]	0	0	0	481	481	481
Total comprehensive income						42,118
Dividends - common stock		0	0	(12,175)	0		(12,175)
Common stock issued		6	67	0	0		73
Common stock repurchased		(41)	(441)	0	0		(482)
Stock based compensation expense		0	1,285	0	0		1,285
Stock activity under incentive comp plans		24	99	(35)	0		88
Balance at Jun. 30, 2010		87,171	747,785	38,617	1,160		874,733
Balance at Dec. 31, 2010		87,183	748,873	44,018	(1,269)		878,805
Comprehensive income
Net income		0	0	33,449	0	33,449	33,449
Other comprehensive income
Change in unrealized gain (loss) on securities available for sale, net of reclassification and tax	[1]	0	0	0	17,340	17,340	17,340
Transferred securities, net of tax	[1]	0	0	0	(580)	(580)	(580)
Reclassification adjustment on cash flows hedges, net of tax	[1]	0	0	0	(278)	(278)	(278)
Net loss, settlement cost and amortization of net (gain) loss on defined benefit pension plans, net of tax	[1]	0	0	0	1,189	1,189	1,189
Total comprehensive income						51,120
Acquisition - Monroe Bancorp		7,575	82,495	0	0		90,070
Dividends - common stock		0	0	(13,263)	0		(13,263)
Common stock issued		10	101	0	0		111
Common stock repurchased		(32)	(301)	0	0		(333)
Stock based compensation expense		0	1,539	0	0		1,539
Stock activity under incentive comp plans		16	235	(26)	0		225
Balance at Jun. 30, 2011		$ 94,752	$ 832,942	$ 64,178	$ 16,402		$ 1,008,274

[1] See Note 5 to the consolidated financial statements.