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Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale $ 164,619 $ 251,651
Commercial and industrial 11,898,852 11,256,945
Leasing 388,044 422,513
Owner occupied 7,394,206 7,589,082
Municipal 453,710 494,183
Total commercial 20,134,812 19,762,723
Construction and land development 2,191,274 1,939,413
Term 7,970,833 8,062,819
Total commercial real estate 10,162,107 10,002,232
Home equity credit line 2,123,913 2,177,680
1-4 family residential 4,485,804 4,350,329
Construction and other consumer real estate 321,839 321,235
Bankcard and other revolving plans 315,487 306,428
Other 212,048 216,379
Total consumer 7,459,091 7,372,051
Total loans 38,187,945 37,665,247
Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 35,704,727 35,028,381
Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 714,365 696,548
Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1,750,031 1,927,313
Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 18,822 13,005
Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 813,912 896,087
Commercial [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 11,898,852 11,256,945
Leasing 388,044 422,513
Owner occupied 7,394,206 7,589,082
Municipal 453,710 494,183
Total commercial 20,134,812 19,762,723
Total loans 20,134,812 19,762,723
Commercial [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 11,218,159 10,717,594
Leasing 383,901 419,482
Owner occupied 6,688,110 6,833,923
Municipal 439,344 453,193
Total commercial 18,729,514 18,424,192
Commercial [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 295,542 198,645
Leasing 1,498 226
Owner occupied 108,812 138,539
Municipal 5,404 31,756
Total commercial 411,256 369,166
Commercial [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 374,377 336,230
Leasing 2,645 2,805
Owner occupied 594,271 612,011
Municipal 8,962 9,234
Total commercial 980,255 960,280
Commercial [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 10,774 4,476
Leasing 0 0
Owner occupied 3,013 4,609
Municipal 0 0
Total commercial 13,787 9,085
Commercial [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total commercial 486,353 510,908
Commercial Real Estate Construction Financing Receivable [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,191,274 1,939,413
Total loans 2,191,274 1,939,413
Commercial Real Estate Construction Financing Receivable [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,035,512 1,648,215
Commercial Real Estate Construction Financing Receivable [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 15,805 57,348
Commercial Real Estate Construction Financing Receivable [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 137,469 233,374
Commercial Real Estate Construction Financing Receivable [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,488 476
Commercial Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 7,970,833 8,062,819
Total commercial real estate 10,162,107 10,002,232
Total loans 10,162,107 10,002,232
Commercial Real Estate [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 7,378,519 7,433,789
Total commercial real estate 9,414,031 9,082,004
Commercial Real Estate [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 255,789 237,201
Total commercial real estate 271,594 294,549
Commercial Real Estate [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 333,978 388,914
Total commercial real estate 471,447 622,288
Commercial Real Estate [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 2,547 2,915
Total commercial real estate 5,035 3,391
Commercial Real Estate [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total commercial real estate 251,278 276,976
Consumer [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 2,123,913 2,177,680
1-4 family residential 4,485,804 4,350,329
Construction and other consumer real estate 321,839 321,235
Bankcard and other revolving plans 315,487 306,428
Other 212,048 216,379
Total consumer 7,459,091 7,372,051
Total loans 7,459,091 7,372,051
Consumer [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 2,083,154 2,138,693
1-4 family residential 4,375,794 4,234,426
Construction and other consumer real estate 313,637 313,499
Bankcard and other revolving plans 308,014 298,665
Other 205,967 209,293
Total consumer 7,286,566 7,194,576
Consumer [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 15 85
1-4 family residential 3,456 4,316
Construction and other consumer real estate 0 218
Bankcard and other revolving plans 17 23
Other 2,498 3,211
Total consumer 5,986 7,853
Consumer [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 40,744 38,897
1-4 family residential 106,554 111,063
Construction and other consumer real estate 8,202 7,518
Bankcard and other revolving plans 7,456 7,740
Other 3,583 3,875
Total consumer 166,539 169,093
Consumer [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 0 5
1-4 family residential 0 524
Construction and other consumer real estate 0 0
Bankcard and other revolving plans 0 0
Other 0 0
Total consumer 0 529
Consumer [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total consumer 70,366 95,656
FDIC-Supported Loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 431,935 528,241
FDIC-Supported Loans [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 274,616 327,609
FDIC-Supported Loans [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 25,529 24,980
FDIC-Supported Loans [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 131,790 175,652
FDIC-Supported Loans [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 0 0
FDIC-Supported Loans [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans $ 5,915 $ 12,547