Loans And Leases (Credit Quality Indicators Credit Exposure) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	$ 9,702,669		$ 9,633,197
Commercial Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	6,096,707		6,235,686
Commercial Credit Exposure [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	1,810,665		1,816,519
Commercial Credit Exposure [Member] | Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	1,696,175	[1]	1,677,506	[1]
Commercial Credit Exposure [Member] | Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	45,237	[2]	59,988	[2]
Commercial Credit Exposure [Member] | Commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	69,253	[3]	79,025	[3]
Commercial Credit Exposure [Member] | Real Estate Construction Commercial Customers Only [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	697,288	[4]	802,285	[4]
Commercial Credit Exposure [Member] | Real Estate Construction Commercial Customers Only [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	540,132	[1],[4]	612,330	[1],[4]
Commercial Credit Exposure [Member] | Real Estate Construction Commercial Customers Only [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	72,082	[2],[4]	64,283	[2],[4]
Commercial Credit Exposure [Member] | Real Estate Construction Commercial Customers Only [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	85,074	[3],[4]	125,672	[3],[4]
Commercial Credit Exposure [Member] | Real Estate Secured Commercial Including Commercial Loans Secured by Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	3,588,754	[5]	3,616,882	[5]
Commercial Credit Exposure [Member] | Real Estate Secured Commercial Including Commercial Loans Secured by Residential Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	3,183,504	[1],[5]	3,134,762	[1],[5]
Commercial Credit Exposure [Member] | Real Estate Secured Commercial Including Commercial Loans Secured by Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	156,283	[2],[5]	201,833	[2],[5]
Commercial Credit Exposure [Member] | Real Estate Secured Commercial Including Commercial Loans Secured by Residential Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	248,967	[3],[5]	280,287	[3],[5]
Commercial Credit Exposure [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	5,419,811	[1]	5,424,598	[1]
Commercial Credit Exposure [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	273,602	[2]	326,104	[2]
Commercial Credit Exposure [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	403,294	[3]	484,984	[3]
Other Credit Exposure [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	3,605,962		3,397,511
Other Credit Exposure [Member] | Real Estate Secured Residential Including Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	2,228,413		2,122,924
Other Credit Exposure [Member] | Real Estate Secured Residential Including Construction Loans [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	2,194,280		2,085,067
Other Credit Exposure [Member] | Real Estate Secured Residential Including Construction Loans [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	34,133	[6]	37,857	[6]
Other Credit Exposure [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	698,805		603,084
Other Credit Exposure [Member] | Consumer [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	697,104		600,627
Other Credit Exposure [Member] | Consumer [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	1,701	[6]	2,457	[6]
Other Credit Exposure [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	678,744		671,503
Other Credit Exposure [Member] | Leases [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	676,496		667,936
Other Credit Exposure [Member] | Leases [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	2,248	[6]	3,567	[6]
Other Credit Exposure [Member] | Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	3,567,880		3,353,630
Other Credit Exposure [Member] | Nonperforming [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Exposure	$ 38,082	[6]	$ 43,881	[6]

[1] Includes loans of acceptable risk. Possibility of loss is considered unlikely.

[2] Includes loans considered potentially weak; however, no loss of principal or interest is anticipated.

[3] Includes loans that are inadequately protected by the current net-worth and paying capacity of the borrower or by the collateral pledged, if any. Loss of principal or interest is considered reasonably possible or likely.

[4] Includes only construction loans granted to commercial customers. Construction loans for individuals are included in Real Estate - Secured - Residential, below.

[5] Includes loans obtained for commercial purposes that are also secured by residential real estate.

[6] Includes loans that are on non-accrual status or past due 90 days or more.