Segment Information (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Segment Reporting Information [Line Items]
Interest income	$ 114,108		$ 126,527		$ 343,344		$ 379,836
Interest expense	12,068		18,993		37,937		58,039
Net interest income	102,040		107,534		305,407		321,797
Provision for non-covered loan and lease losses	7,078		9,089		16,883		39,578
Provision for covered loan and lease losses	2,927		4,420		4,302		15,443
Non-interest income	33,679		24,778		89,842		65,990
Non-interest expense	86,974		86,224		261,606		253,632
Income before income taxes	38,740		32,579		112,458		79,134
Provision for income taxes	13,587		10,717		38,525		26,020
Net income	25,153		21,862		73,933		53,114		74,496
Dividends and undistributed earnings allocated to participating securities	170	[1]	105	[1]	499	[1]	253	[1]
Net earnings available to common shareholders	24,983		21,757		73,434		52,861
Total assets	11,528,964				11,528,964				11,563,355
Total loans and leases (covered and non-covered)	6,763,470				6,763,470				6,510,549
Total deposits	9,099,929				9,099,929				9,236,690
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	105,352		119,385		318,007		360,395
Interest expense	11,137		17,872		35,245		54,703
Net interest income	94,215		101,513		282,762		305,692
Provision for non-covered loan and lease losses	7,078		9,089		16,883		39,578
Provision for covered loan and lease losses	2,927		4,420		4,302		15,443
Non-interest income	5,805		14,179		26,178		37,947
Non-interest expense	72,947		77,187		223,939		227,898
Income before income taxes	17,068		24,996		63,816		60,720
Provision for income taxes	5,031		7,800		19,422		18,974
Net income	12,037		17,196		44,394		41,746
Dividends and undistributed earnings allocated to participating securities	170		105		499		253
Net earnings available to common shareholders	11,867		17,091		43,895		41,493
Total assets	10,824,278				10,824,278				11,086,493
Total loans and leases (covered and non-covered)	6,344,647				6,344,647				6,171,368
Total deposits	8,708,805				8,708,805				8,830,353
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	3,235		3,506		10,704		9,277
Interest expense	197		469		694		1,514
Net interest income	3,038		3,037		10,010		7,763
Non-interest income	3,370		3,397		10,220		10,664
Non-interest expense	3,743		3,720		11,423		11,763
Income before income taxes	2,665		2,714		8,807		6,664
Provision for income taxes	953		969		3,169		2,346
Net income	1,712		1,745		5,638		4,318
Net earnings available to common shareholders	1,712		1,745		5,638		4,318
Total assets	74,273				74,273				53,044
Total loans and leases (covered and non-covered)	59,536				59,536				38,810
Total deposits	352,040				352,040				390,992
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income	5,521		3,636		14,633		10,164
Interest expense	734		652		1,998		1,822
Net interest income	4,787		2,984		12,635		8,342
Non-interest income	24,504		7,202		53,444		17,379
Non-interest expense	10,284		5,317		26,244		13,971
Income before income taxes	19,007		4,869		39,835		11,750
Provision for income taxes	7,603		1,948		15,934		4,700
Net income	11,404		2,921		23,901		7,050
Net earnings available to common shareholders	11,404		2,921		23,901		7,050
Total assets	630,413				630,413				423,818
Total loans and leases (covered and non-covered)	359,287				359,287				300,371
Total deposits	$ 39,084				$ 39,084				$ 15,345

[1] Represents dividends paid and undistributed earnings allocated to nonvested restricted stock awards.