Segment Information (Narrative) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net interest income	$ 72,592	$ 54,168	$ 196,278	$ 164,439
Noninterest expense	95,158	76,102	254,841	231,033
Income before income taxes	24,842	13,645	68,736	37,670
Community Banking [Member]
Net interest income	75,292	63,402	218,356	187,215
Noninterest expense	60,828	57,298	192,071	176,081
Income before income taxes	44,522	21,823	102,013	53,773
Community Banking [Member] | Monroe Bancorp And Integra Bank [Member]
Net interest income	21,000		38,700
Monroe Bancorp And Integra Bank [Member]
Noninterest expense	16,000		31,000
Income before income taxes	$ 10,600		$ 15,000