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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, allowance	$ 130,243	$ 120,104	$ 130,322	$ 116,167
Charge-offs	(12,682)	(7,442)	(20,532)	(19,987)
Recoveries	2,892	3,155	5,840	7,000
(Recapture) Provision	10,589	11,254	15,412	23,891
Balance, end of period, allowance	131,042	127,071	131,042	127,071
Collectively evaluated for impairment, allowance					$ 126,129		$ 118,153
Individually evaluated for impairment, allowance					819		1,151
Total, allowance for non-covered loans and leases	130,243	120,104	130,322	116,167	131,042	$ 130,322	127,071
Collectively evaluated for impairment, loans and leases					16,969,555		15,438,906
Individually evaluated for impairment, loans and leases					54,835		64,169
Total loans and leases, net of deferred fees and costs					17,355,240	16,866,536	15,988,752
Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, allowance					4,094		7,767
Loans acquired with deteriorated credit quality, loans and leases					330,850	438,100	485,677
Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, allowance	51,450	55,340	54,293	55,184
Charge-offs	(564)	(2,102)	(1,066)	(3,431)
Recoveries	220	1,265	720	1,488
(Recapture) Provision	(522)	3,840	(3,363)	5,102
Balance, end of period, allowance	50,584	58,343	50,584	58,343
Collectively evaluated for impairment, allowance					47,427		53,018
Individually evaluated for impairment, allowance					363		774
Total, allowance for non-covered loans and leases	51,450	55,340	54,293	55,184	50,584	54,293	58,343
Collectively evaluated for impairment, loans and leases					9,139,255		8,689,870
Individually evaluated for impairment, loans and leases					34,906		37,711
Total loans and leases, net of deferred fees and costs					9,443,960		9,128,506
Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, allowance					2,794		4,551
Loans acquired with deteriorated credit quality, loans and leases					269,799		400,925
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, allowance	50,781	44,042	47,487	41,216
Charge-offs	(9,594)	(3,714)	(14,249)	(12,651)
Recoveries	1,274	1,113	2,447	2,184
(Recapture) Provision	9,894	4,077	16,670	14,769
Balance, end of period, allowance	52,355	45,518	52,355	45,518
Collectively evaluated for impairment, allowance					51,466		42,665
Individually evaluated for impairment, allowance					456		377
Total, allowance for non-covered loans and leases	50,781	44,042	47,487	41,216	52,355	47,487	45,518
Collectively evaluated for impairment, loans and leases					3,412,760		2,924,846
Individually evaluated for impairment, loans and leases					19,929		26,458
Total loans and leases, net of deferred fees and costs					3,442,086		2,970,839
Commercial | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, allowance					433		2,476
Loans acquired with deteriorated credit quality, loans and leases					9,397		19,535
Residential
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, allowance	20,897	16,221	22,017	15,922
Charge-offs	(294)	(138)	(631)	(536)
Recoveries	293	108	524	139
(Recapture) Provision	(750)	1,773	(1,764)	2,439
Balance, end of period, allowance	20,146	17,964	20,146	17,964
Collectively evaluated for impairment, allowance					19,351		17,294
Individually evaluated for impairment, allowance					0		0
Total, allowance for non-covered loans and leases	20,897	16,221	22,017	15,922	20,146	22,017	17,964
Collectively evaluated for impairment, loans and leases					3,821,080		3,366,001
Individually evaluated for impairment, loans and leases					0		0
Total loans and leases, net of deferred fees and costs					3,871,890		3,430,098
Residential | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, allowance					795		670
Loans acquired with deteriorated credit quality, loans and leases					50,810		64,097
Consumer & Other
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period, allowance	7,115	4,501	6,525	3,845
Charge-offs	(2,230)	(1,488)	(4,586)	(3,369)
Recoveries	1,105	669	2,149	3,189
(Recapture) Provision	1,967	1,564	3,869	1,581
Balance, end of period, allowance	7,957	5,246	7,957	5,246
Collectively evaluated for impairment, allowance					7,885		5,176
Individually evaluated for impairment, allowance					0		0
Total, allowance for non-covered loans and leases	$ 7,115	$ 4,501	$ 6,525	$ 3,845	7,957	$ 6,525	5,246
Collectively evaluated for impairment, loans and leases					596,460		458,189
Individually evaluated for impairment, loans and leases					0		0
Total loans and leases, net of deferred fees and costs					597,304		459,309
Consumer & Other | Receivables Acquired with Deteriorated Credit Quality
Allowance for Loan and Lease Losses [Roll Forward]
Loans acquired with deteriorated credit quality, allowance					72		70
Loans acquired with deteriorated credit quality, loans and leases					$ 844		$ 1,120