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, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest income	$ 115,960		$ 114,108		$ 324,308		$ 343,344
Interest expense	9,151		12,068		29,417		37,937
Net interest income	106,809		102,040		294,891		305,407
Provision for non-covered loan and lease losses	3,008		7,078		12,989		16,883
Provision for covered loan and lease losses	(1,904)		2,927		(4,744)		4,302
Non-interest income	26,144		33,679		94,656		89,842
Non-interest expense	95,604		86,974		269,297		261,606
Income before income taxes	36,245		38,740		112,005		112,458
Provision for income taxes	12,768		13,587		38,914		38,525
Net income	23,477		25,153		73,091		73,933		101,891
Dividends and undistributed earnings allocated to participating securities	196	[1]	170	[1]	576	[1]	499	[1]
Net earnings available to common shareholders	23,281		24,983		72,515		73,434
Total assets	11,569,297				11,569,297				11,795,443
Total loans and leases (covered and non-covered)	7,625,987				7,625,987				7,158,158
Total deposits	9,067,240				9,067,240				9,379,275
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	106,848		105,352		296,943		318,007
Interest expense	8,359		11,137		26,920		35,245
Net interest income	98,489		94,215		270,023		282,762
Provision for non-covered loan and lease losses	3,008		7,078		12,989		16,883
Provision for covered loan and lease losses	(1,904)		2,927		(4,744)		4,302
Non-interest income	6,970		5,805		19,608		26,178
Non-interest expense	81,561		72,947		225,880		223,939
Income before income taxes	22,794		17,068		55,506		63,816
Provision for income taxes	7,395		5,031		16,323		19,422
Net income	15,399		12,037		39,183		44,394
Dividends and undistributed earnings allocated to participating securities	196		170		576		499
Net earnings available to common shareholders	15,203		11,867		38,607		43,895
Total assets	10,799,306				10,799,306				10,984,996
Total loans and leases (covered and non-covered)	7,031,325				7,031,325				6,713,792
Total deposits	8,652,751				8,652,751				8,968,867
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	3,746		3,235		10,957		10,704
Interest expense	178		197		551		694
Net interest income	3,568		3,038		10,406		10,010
Provision for non-covered loan and lease losses	0		0		0		0
Provision for covered loan and lease losses	0		0		0		0
Non-interest income	4,070		3,370		11,803		10,220
Non-interest expense	4,298		3,743		12,531		11,423
Income before income taxes	3,340		2,665		9,678		8,807
Provision for income taxes	1,329		953		3,863		3,169
Net income	2,011		1,712		5,815		5,638
Dividends and undistributed earnings allocated to participating securities	0		0		0		0
Net earnings available to common shareholders	2,011		1,712		5,815		5,638
Total assets	117,534				117,534				90,370
Total loans and leases (covered and non-covered)	101,934				101,934				74,132
Total deposits	363,010				363,010				382,033
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income	5,366		5,521		16,408		14,633
Interest expense	614		734		1,946		1,998
Net interest income	4,752		4,787		14,462		12,635
Provision for non-covered loan and lease losses	0		0		0		0
Provision for covered loan and lease losses	0		0		0		0
Non-interest income	15,104		24,504		63,245		53,444
Non-interest expense	9,745		10,284		30,886		26,244
Income before income taxes	10,111		19,007		46,821		39,835
Provision for income taxes	4,044		7,603		18,728		15,934
Net income	6,067		11,404		28,093		23,901
Dividends and undistributed earnings allocated to participating securities	0		0		0		0
Net earnings available to common shareholders	6,067		11,404		28,093		23,901
Total assets	652,457				652,457				720,077
Total loans and leases (covered and non-covered)	492,728				492,728				370,234
Total deposits	$ 51,479				$ 51,479				$ 28,375

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