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Loans And Allowance For Credit Losses (Summary Of ALLL And Outstanding Loan Balances According To The Company's Impairment Method) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment $ 1,337,579 $ 1,051,819 $ 1,349,974 $ 1,004,217        
Impaired Financing Receivable, Interest Income, Accrual Method 39,844 16,035 69,546 29,412        
Allowance for loan losses: Individually evaluated for impairment (64,107)   (64,107)     (66,640)    
Allowance for loan losses: Collectively evaluated for impairment 744,898   744,898     817,322    
Allowance for loan losses: Purchased loans with evidence of credit deterioration 4,907   4,907     12,125    
Allowance for loan losses: Total 813,912 973,443 813,912 973,443 841,781 896,087 1,011,786 1,051,685
Outstanding loan balances: Individually evaluated for impairment 781,815   781,815     904,496    
Outstanding loan balances: Collectively evaluated for impairment 37,020,624   37,020,624     36,291,555    
Outstanding loan balances: Purchased loans with evidence of credit deterioration 385,506   385,506     469,196    
Total loans 38,187,945   38,187,945     37,665,247    
Commercial And Industrial [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 170,959 163,397 162,330 158,783        
Impaired Financing Receivable, Interest Income, Accrual Method 861 820 1,519 1,509        
Total loans 11,898,852   11,898,852     11,256,945    
Owner Occupied [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 213,757 196,213 209,928 179,503        
Impaired Financing Receivable, Interest Income, Accrual Method 959 644 1,878 1,176        
Total loans 7,394,206   7,394,206     7,589,082    
Commercial [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Allowance for loan losses: Individually evaluated for impairment (36,104)   (36,104)     (30,587)    
Allowance for loan losses: Collectively evaluated for impairment 450,249   450,249     480,321    
Allowance for loan losses: Purchased loans with evidence of credit deterioration 0   0     0    
Allowance for loan losses: Total 486,353 542,170 486,353 542,170 496,930 510,908 547,341 561,351
Outstanding loan balances: Individually evaluated for impairment 341,652   341,652     353,380    
Outstanding loan balances: Collectively evaluated for impairment 19,793,160   19,793,160     19,409,343    
Outstanding loan balances: Purchased loans with evidence of credit deterioration 0   0     0    
Total loans 20,134,812   20,134,812     19,762,723    
Commercial Real Estate [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Allowance for loan losses: Individually evaluated for impairment (16,186)   (16,186)     (22,295)    
Allowance for loan losses: Collectively evaluated for impairment 235,092   235,092     254,681    
Allowance for loan losses: Purchased loans with evidence of credit deterioration 0   0     0    
Allowance for loan losses: Total 251,278 307,965 251,278 307,965 256,421 276,976 334,299 343,747
Outstanding loan balances: Individually evaluated for impairment 329,247   329,247     437,647    
Outstanding loan balances: Collectively evaluated for impairment 9,832,860   9,832,860     9,564,585    
Outstanding loan balances: Purchased loans with evidence of credit deterioration 0   0     0    
Total loans 10,162,107   10,162,107     10,002,232    
Consumer [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Allowance for loan losses: Individually evaluated for impairment (11,817)   (11,817)     (13,758)    
Allowance for loan losses: Collectively evaluated for impairment 58,549   58,549     81,898    
Allowance for loan losses: Purchased loans with evidence of credit deterioration 0   0     0    
Allowance for loan losses: Total 70,366 102,391 70,366 102,391 84,622 95,656 109,101 123,115
Outstanding loan balances: Individually evaluated for impairment 109,860   109,860     112,320    
Outstanding loan balances: Collectively evaluated for impairment 7,349,231   7,349,231     7,259,731    
Outstanding loan balances: Purchased loans with evidence of credit deterioration 0   0     0    
Total loans 7,459,091   7,459,091     7,372,051    
FDIC- Supported [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Allowance for loan losses: Individually evaluated for impairment 0   0     0    
Allowance for loan losses: Collectively evaluated for impairment 1,008   1,008     422    
Allowance for loan losses: Purchased loans with evidence of credit deterioration 4,907   4,907     12,125    
Allowance for loan losses: Total 5,915 [1] 20,917 [1] 5,915 [1] 20,917 [1] 3,808 [1] 12,547 21,045 23,472
Outstanding loan balances: Individually evaluated for impairment 1,056   1,056     1,149    
Outstanding loan balances: Collectively evaluated for impairment 45,373   45,373     57,896    
Outstanding loan balances: Purchased loans with evidence of credit deterioration 385,506   385,506     469,196    
Total loans 431,935   431,935     528,241    
Municipal [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Total loans 453,710   453,710     494,183    
Commercial Loan [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 384,716 359,610 372,258 338,286        
Impaired Financing Receivable, Interest Income, Accrual Method 1,820 1,464 3,397 2,685        
Total loans 20,134,812   20,134,812     19,762,723    
Commercial Real Estate Construction Financing Receivable [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 142,428 218,087 145,234 207,418        
Impaired Financing Receivable, Interest Income, Accrual Method 1,558 1,385 2,215 2,940        
Total loans 2,191,274   2,191,274     1,939,413    
Term [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 284,518 268,798 287,464 255,229        
Impaired Financing Receivable, Interest Income, Accrual Method 1,984 1,416 3,824 2,789        
Total loans 7,970,833   7,970,833     8,062,819    
Commercial Real Estate [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 426,946 486,885 432,698 462,647        
Impaired Financing Receivable, Interest Income, Accrual Method 3,542 2,801 6,039 5,729        
Total loans 10,162,107   10,162,107     10,002,232    
Home Equity Line of Credit [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 13,462 906 12,459 998        
Impaired Financing Receivable, Interest Income, Accrual Method 85 2 143 4        
Total loans 2,123,913   2,123,913     2,177,680    
One Through Four Family Residential [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 100,395 93,188 98,914 86,799        
Impaired Financing Receivable, Interest Income, Accrual Method 354 437 725 758        
Total loans 4,485,804   4,485,804     4,350,329    
Construction And Other Consumer Real Estate [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 5,626 7,079 5,874 6,763        
Impaired Financing Receivable, Interest Income, Accrual Method 47 43 93 88        
Total loans 321,839   321,839     321,235    
Revolving Credit Facility [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment   98   49        
Impaired Financing Receivable, Interest Income, Accrual Method   0   0        
Total loans 315,487   315,487     306,428    
Consumer Other Financing Receivable [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 1,782 1,550 1,799 2,105        
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 0 0        
Total loans 212,048   212,048     216,379    
Consumer Loan [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 121,265 102,821 119,046 96,714        
Impaired Financing Receivable, Interest Income, Accrual Method 486 482 961 850        
Total loans 7,459,091   7,459,091     7,372,051    
Fdic Supported Loans [Member]
                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Impaired Financing Receivable, Average Recorded Investment 404,652 102,503 425,972 106,570        
Impaired Financing Receivable, Interest Income, Accrual Method 33,996 [2] 11,288 [2] 59,149 [2] 20,148 [2]        
Total loans $ 431,935   $ 431,935     $ 528,241    
[1] The Purchased Loans section following contains further discussion related to FDIC-supported loans.
[2] The balance of interest income recognized results primarily from accretion of interest income on impaired FDIC-supported loans.