Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended						3 Months Ended
	Aug. 31, 2010	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Mar. 31, 2011 Monroe Bancorp [Member]	Dec. 31, 2011 Integra Bank [Member]	Sep. 30, 2011 Integra Bank [Member]	Jun. 30, 2011 Community Banking [Member]	Mar. 31, 2011 Community Banking [Member]	Mar. 31, 2011 Other [Member]
Goodwill [Line Items]
Goodwill impairment	$ 0
Goodwill		253,177,000	236,309,000	253,177,000		167,884,000	68,400,000		16,900,000		67,500,000	900,000
Other intangible assets estimated useful life, Minimum (in years)		5
Other intangible assets estimated useful life, Maximum (in years)		25
Core deposit intangibles							8,200,000		4,300,000
Customer relationship intangibles				300,000	1,300,000		2,300,000			100,000
Amortization expense of other intangible assets		$ 2,021,000	$ 1,924,000					$ 700,000