Allowance for Loan and Lease Loss and Credit Quality (Activity In The Allowance For Loan And Lease Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	$ 127,071	$ 106,495	$ 116,167	$ 95,085
Charge-offs	(8,476)	(7,524)	(28,463)	(21,090)
Recoveries	3,385	2,331	10,385	6,640
Provision (recapture)	8,153	14,333	32,044	35,000
Balance, end of period, Allowance	130,133	115,635	130,133	115,635
Collectively evaluated for impairment, Allowance					$ 125,302		$ 106,925
Individually evaluated for impairment, Allowance					923		1,169
Total, Allowance for non-covered loans and leases	127,071	106,495	116,167	95,085	130,133	$ 116,167	115,635
Collectively evaluated for impairment, Loans and leases					15,879,403		14,516,805
Individually evaluated for impairment, Loans and leases					60,443		106,377
Total loans and leases, net of deferred fees and costs					16,387,934	15,327,732	15,259,201
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	58,164	56,920	55,184	59,538
Charge-offs	(2,789)	(1,104)	(5,618)	(4,674)
Recoveries	960	393	2,448	1,993
Provision (recapture)	1,878	430	6,199	(218)
Balance, end of period, Allowance	58,213	56,639	58,213	56,639
Collectively evaluated for impairment, Allowance					54,660		51,283
Individually evaluated for impairment, Allowance					533		1,156
Total, Allowance for non-covered loans and leases	58,164	56,920	55,184	59,538	58,213	55,184	56,639
Collectively evaluated for impairment, Loans and leases					8,741,621		8,388,827
Individually evaluated for impairment, Loans and leases					34,734		85,804
Total loans and leases, net of deferred fees and costs					9,147,374		8,996,699
Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	45,697	35,426	41,216	27,028
Charge-offs	(3,266)	(4,424)	(11,544)	(13,105)
Recoveries	1,360	1,412	3,544	3,618
Provision (recapture)	2,823	8,817	13,398	23,690
Balance, end of period, Allowance	46,614	41,231	46,614	41,231
Collectively evaluated for impairment, Allowance					46,087		38,681
Individually evaluated for impairment, Allowance					390		13
Total, Allowance for non-covered loans and leases	45,697	35,426	41,216	27,028	46,614	41,216	41,231
Collectively evaluated for impairment, Loans and leases					3,050,922		2,898,567
Individually evaluated for impairment, Loans and leases					25,709		20,445
Total loans and leases, net of deferred fees and costs					3,091,902		2,956,620
Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	17,964	11,953	15,922	7,487
Charge-offs	(171)	(727)	(617)	(1,473)
Recoveries	281	49	420	351
Provision (recapture)	1,186	1,697	3,535	6,607
Balance, end of period, Allowance	19,260	12,972	19,260	12,972
Collectively evaluated for impairment, Allowance					18,577		12,239
Individually evaluated for impairment, Allowance					0		0
Total, Allowance for non-covered loans and leases	17,964	11,953	15,922	7,487	19,260	15,922	12,972
Collectively evaluated for impairment, Loans and leases					3,589,753		2,864,076
Individually evaluated for impairment, Loans and leases					0		0
Total loans and leases, net of deferred fees and costs					3,650,515		2,938,387
Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, Allowance	5,246	2,196	3,845	1,032
Charge-offs	(2,250)	(1,269)	(10,684)	(1,838)
Recoveries	784	477	3,973	678
Provision (recapture)	2,266	3,389	8,912	4,921
Balance, end of period, Allowance	6,046	4,793	6,046	4,793
Collectively evaluated for impairment, Allowance					5,978		4,722
Individually evaluated for impairment, Allowance					0		0
Total, Allowance for non-covered loans and leases	$ 5,246	$ 2,196	$ 3,845	$ 1,032	6,046	3,845	4,793
Collectively evaluated for impairment, Loans and leases					497,107		365,335
Individually evaluated for impairment, Loans and leases					0		128
Total loans and leases, net of deferred fees and costs					498,143	389,036	367,495
Receivables Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance					3,908		7,541
Loans acquired with deteriorated credit quality, Loans and leases					448,088	$ 562,900	636,019
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance					3,020		4,200
Loans acquired with deteriorated credit quality, Loans and leases					371,019		522,068
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance					137		2,537
Loans acquired with deteriorated credit quality, Loans and leases					15,271		37,608
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance					683		733
Loans acquired with deteriorated credit quality, Loans and leases					60,762		74,311
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer & Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, Allowance					68		71
Loans acquired with deteriorated credit quality, Loans and leases					$ 1,036		$ 2,032