Loans (Schedule Of Loan Portfolio Non-Covered And Covered PCI Loans And Non-PCI Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	$ 10,897,337	$ 9,527,797
Covered loans	252,185	271,844
Total loans	11,149,522	9,799,641
Total Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,778,448	3,985,092
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,417,345	1,378,728
Covered loans	4,505	4,931
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,170,378	1,878,387
Covered loans	70,757	83,742
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	4,347,542	3,574,089
Covered loans	154,522	160,651
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	430,906	411,003
Covered loans	7,763	6,974
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,531,166	2,285,590
Covered loans	14,638	15,546
Home Equity [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	507,560	469,604
Automobile Loans [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	764,082	772,490
Other Consumer [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	145,703	136,634
Non PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	9,737,639	9,527,797
Total loans	9,737,639	9,527,797
Non PCI Loans [Member] | Total Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,999,423	3,985,092
Non PCI Loans [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,364,118	1,378,728
Non PCI Loans [Member] | Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,862,135	1,878,387
Non PCI Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	3,614,660	3,574,089
Non PCI Loans [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	384,763	411,003
Non PCI Loans [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	2,511,963	2,285,590
Non PCI Loans [Member] | Home Equity [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	456,727	469,604
Non PCI Loans [Member] | Automobile Loans [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	764,082	772,490
Non PCI Loans [Member] | Other Consumer [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	143,309	136,634
PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	1,159,698
Covered loans	252,185	271,844
Total loans	1,411,883	271,844
PCI Loans [Member] | Total Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	779,025
PCI Loans [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	53,227
Covered loans	4,505	4,931
PCI Loans [Member] | Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	308,243
Covered loans	70,757	83,742
PCI Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	732,882
Covered loans	154,522	160,651
PCI Loans [Member] | Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	46,143
Covered loans	7,763	6,974
PCI Loans [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	19,203
Covered loans	14,638	15,546
PCI Loans [Member] | Home Equity [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	50,833
PCI Loans [Member] | Other Consumer [Member] | Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-covered loans	$ 2,394