Segment Information (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest income	$ 104,333		$ 115,642
Interest expense	10,144		13,287
Net interest income	94,189		102,355
Provision for non-covered loan and lease losses	6,988		3,167
Provision for covered loan and lease losses	232		(31)
Non-interest income	34,015		27,237
Non-interest expense	85,762		87,696
Income before income taxes	35,222		38,760
Provision for income taxes	11,861		13,257
Net income	23,361		25,503		101,891
Dividends and undistributed earnings allocated to participating securities	183	[1]	167	[1]
Net earnings available to common shareholders	23,178		25,336
Total assets	11,491,410				11,795,443
Total loans and leases (covered and non-covered)	7,113,046				7,158,158
Total deposits	9,071,655				9,379,275
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	95,011		107,280
Interest expense	9,281		12,421
Net interest income	85,730		94,859
Provision for non-covered loan and lease losses	6,988		3,167
Provision for covered loan and lease losses	232		(31)
Non-interest income	6,496		10,864
Non-interest expense	71,458		76,719
Income before income taxes	13,548		25,868
Provision for income taxes	3,191		8,222
Net income	10,357		17,646
Dividends and undistributed earnings allocated to participating securities	183		167
Net earnings available to common shareholders	10,174		17,479
Total assets	10,780,015				10,984,996
Total loans and leases (covered and non-covered)	6,587,045				6,713,792
Total deposits	8,656,052				8,968,867
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	3,724		4,118
Interest expense	190		267
Net interest income	3,534		3,851
Provision for non-covered loan and lease losses	0		0
Provision for covered loan and lease losses	0		0
Non-interest income	3,790		3,090
Non-interest expense	4,002		3,729
Income before income taxes	3,322		3,212
Provision for income taxes	1,329		1,163
Net income	1,993		2,049
Dividends and undistributed earnings allocated to participating securities	0		0
Net earnings available to common shareholders	1,993		2,049
Total assets	100,372				90,370
Total loans and leases (covered and non-covered)	85,263				74,132
Total deposits	384,898				382,033
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income	5,598		4,244
Interest expense	673		599
Net interest income	4,925		3,645
Provision for non-covered loan and lease losses	0		0
Provision for covered loan and lease losses	0		0
Non-interest income	23,729		13,283
Non-interest expense	10,302		7,248
Income before income taxes	18,352		9,680
Provision for income taxes	7,341		3,872
Net income	11,011		5,808
Dividends and undistributed earnings allocated to participating securities	0		0
Net earnings available to common shareholders	11,011		5,808
Total assets	611,023				720,077
Total loans and leases (covered and non-covered)	440,738				370,234
Total deposits	$ 30,705				$ 28,375

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