Allowance For Non-Covered Loan Loss And Credit Quality (Activity In The Non-Covered Allowance For Loan And Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	$ 92,968	$ 101,921
Charge-offs	(12,691)	(20,875)
Recoveries	3,226	1,757
Provision	3,167	15,030
Balance, end of period, Allowance	86,670	97,833
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	20,485	22,146
Charge-offs	(3,843)	(8,176)
Recoveries	2,060	396
Provision	(816)	6,432
Balance, end of period, Allowance	17,886	20,798
Consumer & Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	867	803
Charge-offs	(488)	(534)
Recoveries	116	94
Provision	367	493
Balance, end of period, Allowance	862	856
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	59,574	64,405
Charge-offs	(5,772)	(11,431)
Recoveries	955	1,246
Provision	3,269	9,308
Balance, end of period, Allowance	58,026	63,528
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	7,625	5,926
Charge-offs	(2,588)	(734)
Recoveries	95	21
Provision	974	413
Balance, end of period, Allowance	6,106	5,626
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period, Allowance	4,417	8,641
Charge-offs
Recoveries
Provision	(627)	(1,616)
Balance, end of period, Allowance	3,790	7,025
Allowance For Non-Covered Loans And Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	86,670	97,833
Collectively evaluated for impairment, Allowance	85,901	96,734
Individually evaluated for impairment, Allowance	769	1,099
Allowance For Non-Covered Loans And Leases [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	17,886	20,798
Collectively evaluated for impairment, Allowance	17,886	20,790
Individually evaluated for impairment, Allowance		8
Allowance For Non-Covered Loans And Leases [Member] | Consumer & Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	862	856
Collectively evaluated for impairment, Allowance	862	856
Allowance For Non-Covered Loans And Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	58,026	63,528
Collectively evaluated for impairment, Allowance	57,260	62,444
Individually evaluated for impairment, Allowance	766	1,084
Allowance For Non-Covered Loans And Leases [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	6,106	5,626
Collectively evaluated for impairment, Allowance	6,103	5,619
Individually evaluated for impairment, Allowance	3	7
Allowance For Non-Covered Loans And Leases [Member] | Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, end of period, Allowance	3,790	7,025
Collectively evaluated for impairment, Allowance	3,790	7,025
Non-Covered Loans And Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Non-covered loans and leases	5,801,474	5,440,023
Individually evaluated for impairment, Non-covered loans and leases	151,180	203,624
Total Non-covered Loans and Leases	5,952,654	5,643,647
Non-Covered Loans And Leases [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Non-covered loans and leases	1,427,710	1,242,883
Individually evaluated for impairment, Non-covered loans and leases	23,581	28,766
Total Non-covered Loans and Leases	1,451,291	1,271,649
Non-Covered Loans And Leases [Member] | Consumer & Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Non-covered loans and leases	37,082	31,601
Total Non-covered Loans and Leases	37,082	31,601
Non-Covered Loans And Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Non-covered loans and leases	3,726,385	3,664,735
Individually evaluated for impairment, Non-covered loans and leases	127,471	174,680
Total Non-covered Loans and Leases	3,853,856	3,839,415
Non-Covered Loans And Leases [Member] | Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively evaluated for impairment, Non-covered loans and leases	610,297	500,804
Individually evaluated for impairment, Non-covered loans and leases	128	178
Total Non-covered Loans and Leases	$ 610,425	$ 500,982