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Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]                
Balance at end of period $ 675,907 $ 813,912 $ 675,907 $ 813,912 $ 736,953 $ 746,291 $ 841,781 $ 896,087
Loans held for sale 164,374   164,374     171,328    
Commercial and industrial 12,805,303   12,805,303     12,481,083    
Leasing 415,205   415,205     387,929    
Owner occupied 7,386,414   7,386,414     7,437,195    
Municipal 522,327   522,327     449,418    
Total commercial 21,129,249   21,129,249     20,755,625    
Construction and land development 2,340,249   2,340,249     2,182,821    
Term 7,968,625   7,968,625     8,005,837    
Total commercial real estate 10,308,874   10,308,874     10,188,658    
Home equity credit line 2,204,174   2,204,174     2,133,120    
1-4 family residential 4,827,067   4,827,067     4,736,665    
Construction and other consumer real estate 338,170   338,170     324,922    
Bankcard and other revolving plans 376,366   376,366     356,240    
Other 195,895   195,895     197,864    
Total consumer 7,941,672   7,941,672     7,748,811    
FDIC-supported loans 250,568   250,568     350,271    
Total loans 39,630,363   39,630,363     39,043,365    
Provision for loan losses (54,416) (21,990) (55,026) (51,025)        
Change In Allowance Covered By F D I C Indemnification (444) (209) (1,261) (7,638)        
Allowance for Loan and Lease Losses, Write-offs (23,400) (35,099) (44,195) (70,566)        
Allowance for Loan and Lease Losses, Recoveries of Bad Debts 17,214 29,429 30,098 47,054        
Net loan and lease charge-offs (6,186) (5,670) (14,097) (23,512)        
Reserve for unfunded lending commitments 95,472 104,082 95,472 104,082 88,693 89,705 100,455 106,809
Provision for Unfunded Lending Commitments 6,779 3,627 5,767 (2,727)        
Total allowance for credit losses 771,379 917,994 771,379 917,994        
FDIC- Supported [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Balance at end of period 3,877 [1] 5,915 [1] 3,877 [1] 5,915 [1] 4,779 [1] 6,918 [1] 3,808 [1] 12,547 [1]
Total loans 250,568   250,568     350,271    
Provision for loan losses 42 [1] 2,688 [1] (1,815) 530 [1]        
Change In Allowance Covered By F D I C Indemnification (444) [1] (209) [1] (1,261) [1] (7,638) [1]        
Allowance for Loan and Lease Losses, Write-offs (1,178) [1] (1,382) [1] (1,881) [1] (1,588) [1]        
Allowance for Loan and Lease Losses, Recoveries of Bad Debts 678 [1] 1,010 [1] 1,916 [1] 2,064 [1]        
Net loan and lease charge-offs (500) [1] (372) [1] 35 [1] 476 [1]        
Reserve for unfunded lending commitments 0 [1] 0 [1] 0 [1] 0 [1] 0 [1] 0 0 [1] 0 [1]
Provision for Unfunded Lending Commitments 0 [1] 0 [1] 0 [1] 0 [1]        
Total allowance for credit losses 3,877 [1] 5,915 [1] 3,877 [1] 5,915 [1]        
Consumer Portfolio Segment [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Balance at end of period 44,535 70,366 44,535 70,366 51,080 60,865 84,622 95,656
Home equity credit line 2,204,174   2,204,174     2,133,120    
1-4 family residential 4,827,067   4,827,067     4,736,665    
Construction and other consumer real estate 338,170   338,170     324,922    
Bankcard and other revolving plans 376,366   376,366     356,240    
Other 195,895   195,895     197,864    
Total consumer 7,941,672   7,941,672     7,748,811    
Total loans 7,941,672   7,941,672     7,748,811    
Provision for loan losses (5,232) (8,274) (14,100) (13,294)        
Change In Allowance Covered By F D I C Indemnification    0    0        
Allowance for Loan and Lease Losses, Write-offs (4,258) (9,102) (7,372) (19,039)        
Allowance for Loan and Lease Losses, Recoveries of Bad Debts 2,945 3,120 5,142 7,043        
Net loan and lease charge-offs (1,313) (5,982) (2,230) (11,996)        
Reserve for unfunded lending commitments 3,982 1,356 3,982 1,356 3,550 3,875 1,583 1,583
Provision for Unfunded Lending Commitments 432 (227) 107 (227)        
Total allowance for credit losses 48,517 71,722 48,517 71,722        
Commercial Real Estate [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Balance at end of period 187,261 251,278 187,261 251,278 206,546 213,363 256,421 276,976
Term 7,968,625   7,968,625     8,005,837    
Total commercial real estate 10,308,874   10,308,874     10,188,658    
Total loans 10,308,874   10,308,874     10,188,658    
Provision for loan losses (19,348) (11,222) (20,915) (29,850)        
Change In Allowance Covered By F D I C Indemnification    0    0        
Allowance for Loan and Lease Losses, Write-offs (2,961) (6,107) (10,815) (13,331)        
Allowance for Loan and Lease Losses, Recoveries of Bad Debts 3,024 12,186 5,628 17,483        
Net loan and lease charge-offs 63 6,079 (5,187) 4,152        
Reserve for unfunded lending commitments 38,689 39,454 38,689 39,454 35,273 37,485 33,240 37,852
Provision for Unfunded Lending Commitments 3,416 6,214 1,204 1,602        
Total allowance for credit losses 225,950 290,732 225,950 290,732        
Commercial [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Balance at end of period 440,234 486,353 440,234 486,353 474,548 465,145 496,930 510,908
Commercial and industrial 12,805,303   12,805,303     12,481,083    
Leasing 415,205   415,205     387,929    
Owner occupied 7,386,414   7,386,414     7,437,195    
Municipal 522,327   522,327     449,418    
Total commercial 21,129,249   21,129,249     20,755,625    
Total loans 21,129,249   21,129,249     20,755,625    
Provision for loan losses (29,878) (5,182) (18,196) (8,411)        
Change In Allowance Covered By F D I C Indemnification    0    0        
Allowance for Loan and Lease Losses, Write-offs (15,003) (18,508) (24,127) (36,608)        
Allowance for Loan and Lease Losses, Recoveries of Bad Debts 10,567 13,113 17,412 20,464        
Net loan and lease charge-offs (4,436) (5,395) (6,715) (16,144)        
Reserve for unfunded lending commitments 52,801 63,272 52,801 63,272 49,870 48,345 65,632 67,374
Provision for Unfunded Lending Commitments 2,931 (2,360) 4,456 (4,102)        
Total allowance for credit losses $ 493,035 $ 549,625 $ 493,035 $ 549,625        
[1] The Purchased Loans section following contains further discussion related to FDIC-supported/PCI loans.