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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
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial $ 13,451,886 $ 13,211,481
Leasing 422,969 441,666
Commercial Lending Loans - Owner Occupied 6,961,807 7,150,028
Loans and Leases Receivable, Gross, Commercial, Governments 778,335 675,839
Construction and land development 2,018,655 1,841,502
Term 9,322,138 8,514,401
Loans Receivable, Gross, Commercial, Real Estate 11,340,793 10,355,903
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,645,192 2,416,357
1-4 family residential 5,890,714 5,382,099
Loans and Leases Receivable, Gross, Consumer, Construction 486,712 385,240
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 481,063 443,780
Loans and Leases Receivable, Gross, Consumer, Other 189,794 187,149
Loans and Leases Receivable, Gross 42,649,265 40,649,542
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 13,451,886  
Leasing 422,969  
Commercial Lending Loans - Owner Occupied 6,961,807  
Loans and Leases Receivable, Gross, Commercial, Governments 778,335  
Loans and Leases Receivable before Fees, Gross 21,614,997 21,479,014
Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,018,655  
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 9,322,138  
Loans Receivable, Gross, Commercial, Real Estate 11,340,793 10,355,903
Loans and Leases Receivable, Gross 2,018,655 1,841,502
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,645,192  
1-4 family residential 5,890,714  
Loans and Leases Receivable, Gross, Consumer, Construction 486,712  
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 481,063  
Loans and Leases Receivable, Gross, Consumer, Other 189,794  
Loans and Leases Receivable, Gross 189,794 187,149
Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 9,693,475 8,814,625
Loans and Leases Receivable, Gross 9,693,475 8,814,625
Pass [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial   12,007,076
Leasing   411,131
Commercial Lending Loans - Owner Occupied   6,720,052
Loans and Leases Receivable, Gross, Commercial, Governments   663,903
Construction and land development   1,786,610
Term   8,319,348
Loans and Leases Receivable, Gross, Consumer, Home Equity   2,404,635
1-4 family residential   5,325,519
Loans and Leases Receivable, Gross, Consumer, Construction   381,738
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card   440,282
Loans and Leases Receivable, Gross, Consumer, Other   186,836
Loans and Leases Receivable, Gross 40,564,532 38,647,130
Pass [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 12,184,707  
Leasing 387,275  
Commercial Lending Loans - Owner Occupied 6,560,030  
Loans and Leases Receivable, Gross, Commercial, Governments 765,025  
Loans and Leases Receivable before Fees, Gross 19,897,037 19,802,162
Pass [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 1,941,411  
Pass [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 9,096,745  
Loans Receivable, Gross, Commercial, Real Estate 11,038,156 10,105,958
Pass [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,629,285  
1-4 family residential 5,850,771  
Loans and Leases Receivable, Gross, Consumer, Construction 482,167  
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 477,756  
Loans and Leases Receivable, Gross, Consumer, Other 189,360  
Pass [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 9,629,339 8,739,010
Special Mention [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial   399,847
Leasing   5,166
Commercial Lending Loans - Owner Occupied   139,784
Loans and Leases Receivable, Gross, Commercial, Governments   0
Construction and land development   42,348
Term   47,245
Loans and Leases Receivable, Gross, Consumer, Home Equity   0
1-4 family residential   0
Loans and Leases Receivable, Gross, Consumer, Construction   0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card   0
Loans and Leases Receivable, Gross, Consumer, Other   0
Loans and Leases Receivable, Gross 508,045 634,390
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 266,027  
Leasing 4,689  
Commercial Lending Loans - Owner Occupied 96,464  
Loans and Leases Receivable, Gross, Commercial, Governments 7,236  
Loans and Leases Receivable before Fees, Gross 374,416 544,797
Special Mention [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 51,931  
Special Mention [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 81,698  
Loans Receivable, Gross, Commercial, Real Estate 133,629 89,593
Special Mention [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 0  
1-4 family residential 0  
Loans and Leases Receivable, Gross, Consumer, Construction 0  
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 0  
Loans and Leases Receivable, Gross, Consumer, Other 0  
Special Mention [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 0 0
Sub-Standard [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial   804,403
Leasing   25,369
Commercial Lending Loans - Owner Occupied   290,192
Loans and Leases Receivable, Gross, Commercial, Governments   11,936
Construction and land development   12,544
Term   139,036
Loans and Leases Receivable, Gross, Consumer, Home Equity   11,722
1-4 family residential   56,580
Loans and Leases Receivable, Gross, Consumer, Construction   3,502
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card   3,498
Loans and Leases Receivable, Gross, Consumer, Other   313
Loans and Leases Receivable, Gross 1,572,420 1,359,095
Sub-Standard [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 997,872  
Leasing 30,017  
Commercial Lending Loans - Owner Occupied 305,313  
Loans and Leases Receivable, Gross, Commercial, Governments 6,074  
Loans and Leases Receivable before Fees, Gross 1,339,276 1,131,900
Sub-Standard [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 25,313  
Sub-Standard [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 143,695  
Loans Receivable, Gross, Commercial, Real Estate 169,008 151,580
Sub-Standard [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 15,907  
1-4 family residential 39,943  
Loans and Leases Receivable, Gross, Consumer, Construction 4,545  
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 3,307  
Loans and Leases Receivable, Gross, Consumer, Other 434  
Sub-Standard [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 64,136 75,615
Doubtful [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial   155
Leasing   0
Commercial Lending Loans - Owner Occupied   0
Loans and Leases Receivable, Gross, Commercial, Governments   0
Construction and land development   0
Term   8,772
Loans and Leases Receivable, Gross, Consumer, Home Equity   0
1-4 family residential   0
Loans and Leases Receivable, Gross, Consumer, Construction   0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card   0
Loans and Leases Receivable, Gross, Consumer, Other   0
Loans and Leases Receivable, Gross 4,268 8,927
Doubtful [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 3,280  
Leasing 988  
Commercial Lending Loans - Owner Occupied 0  
Loans and Leases Receivable, Gross, Commercial, Governments 0  
Loans and Leases Receivable before Fees, Gross 4,268 155
Doubtful [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 0  
Doubtful [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Term 0  
Loans Receivable, Gross, Commercial, Real Estate 0 8,772
Doubtful [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 0  
1-4 family residential 0  
Loans and Leases Receivable, Gross, Consumer, Construction 0  
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 0  
Loans and Leases Receivable, Gross, Consumer, Other 0  
Doubtful [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 0 0
Total Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 567,522 606,048
Total Allowance [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross 420,720 454,277
Total Allowance [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Receivable, Gross, Commercial, Real Estate 115,927 113,992
Total Allowance [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable before Fees, Gross $ 30,875 $ 37,779