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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
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale $ 220,240 $ 201,590
Commercial and industrial 10,748,266 10,334,858
Leasing 405,012 379,709
Owner occupied 7,669,218 8,158,556
Municipal 469,237 441,241
Total commercial 19,291,733 19,314,364
Construction and land development 1,956,186 2,264,909
Term 8,139,546 7,883,434
Total commercial real estate 10,095,732 10,148,343
Home equity credit line 2,175,338 2,187,428
1-4 family residential 4,181,002 3,921,216
Construction and other consumer real estate 320,087 305,873
Bankcard and other revolving plans 294,827 291,018
Other 223,534 225,540
Total consumer 7,194,788 6,931,075
FDIC-supported loans 588,566 750,870
Total loans 37,170,819 37,144,652
Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale 219,632 182,626
Total loans 34,344,145 33,972,984
Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale 0 0
Total loans 833,911 919,598
Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale 579 18,964
Total loans 1,979,441 2,225,424
Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale 29 0
Total loans 13,322 26,646
Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans held for sale 0 0
Total loans 925,341 1,049,958
Commercial [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 10,748,266 10,334,858
Leasing 405,012 379,709
Owner occupied 7,669,218 8,158,556
Municipal 469,237 441,241
Total commercial 19,291,733 19,314,364
Total loans 19,291,733 19,314,364
Commercial [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 10,137,286 9,612,143
Leasing 398,063 362,711
Owner occupied 6,932,995 7,481,207
Municipal 459,929 425,807
Total commercial 17,928,273 17,881,868
Commercial [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 282,677 271,845
Leasing 589 5,878
Owner occupied 156,653 184,821
Municipal 3,411 15,434
Total commercial 443,330 477,978
Commercial [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 323,196 442,139
Leasing 6,343 11,120
Owner occupied 573,761 486,584
Municipal 5,897 0
Total commercial 909,197 939,843
Commercial [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 5,107 8,731
Leasing 17 0
Owner occupied 5,809 5,944
Municipal 0 0
Total commercial 10,933 14,675
Commercial [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total commercial 604,791 627,825
Construction And Land Development [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 1,956,186 2,264,909
Construction And Land Development [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 1,545,806 1,647,741
Construction And Land Development [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 137,660 187,323
Construction And Land Development [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 272,210 426,152
Construction And Land Development [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 510 3,693
Commercial Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 8,139,546 7,883,434
Total commercial real estate 10,095,732 10,148,343
Total loans 10,095,732 10,148,343
Commercial Real Estate [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 7,479,468 7,243,678
Total commercial real estate 9,025,274 8,891,419
Commercial Real Estate [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 222,114 196,377
Total commercial real estate 359,774 383,700
Commercial Real Estate [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 436,085 437,390
Total commercial real estate 708,295 863,542
Commercial Real Estate [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 1,879 5,989
Total commercial real estate 2,389 9,682
Commercial Real Estate [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total commercial real estate 210,087 275,546
Consumer [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 2,175,338 2,187,428
1-4 family residential 4,181,002 3,921,216
Construction and other consumer real estate 320,087 305,873
Bankcard and other revolving plans 294,827 291,018
Other 223,534 225,540
Total consumer 7,194,788 6,931,075
Total loans 7,194,788 6,931,075
Consumer [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 2,133,557 2,136,190
1-4 family residential 4,064,901 3,788,958
Construction and other consumer real estate 309,983 274,712
Bankcard and other revolving plans 284,192 278,767
Other 219,501 221,114
Total consumer 7,012,134 6,699,741
Consumer [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 83 106
1-4 family residential 2,934 5,736
Construction and other consumer real estate 510 12,206
Bankcard and other revolving plans 2,918 3,832
Other 0 163
Total consumer 6,445 22,043
Consumer [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 41,698 51,089
1-4 family residential 113,167 126,277
Construction and other consumer real estate 9,594 16,967
Bankcard and other revolving plans 7,717 8,419
Other 4,033 4,256
Total consumer 176,209 207,008
Consumer [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Home equity credit line 0 43
1-4 family residential 0 245
Construction and other consumer real estate 0 1,988
Bankcard and other revolving plans 0 0
Other 0 7
Total consumer 0 2,283
Consumer [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total consumer 97,613 123,115
FDIC-Supported Loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 588,566 750,870
FDIC-Supported Loans [Member] | Pass [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 378,464 499,956
FDIC-Supported Loans [Member] | Special Mention [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 24,362 35,877
FDIC-Supported Loans [Member] | Sub-Standard [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 185,740 215,031
FDIC-Supported Loans [Member] | Doubtful [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans 0 6
FDIC-Supported Loans [Member] | Total Allowance [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
FDIC-supported loans $ 12,850 $ 23,472