Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009	Mar. 31, 2011 Monroe Bancorp [Member]	Sep. 30, 2011 Integra Bank [Member]	Mar. 31, 2011 Community Banking [Member]	Mar. 31, 2011 Other Segment [Member]
Goodwill impairment	$ 0
Goodwill		265,985,000	167,884,000	265,985,000	167,884,000		167,884,000	167,884,000	68,400,000	29,700,000	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		4,300,000		4,300,000					8,200,000
Customer relationship intangibles						1,300,000			2,300,000
Amortization expense of other intangible assets		$ 2,106,000	$ 1,501,000	$ 5,868,000	$ 4,627,000