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Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Loans And Leases Receivable [Line Items]    
Current $ 63,487,050 $ 63,854,815
30-89 Days past due 629,060 730,901
Purchased impaired 394,697 447,114
Nonaccrual 964,906 1,013,176
Total 65,971,866 66,570,957
Commercial, Financial, Leasing, etc. [Member]
   
Loans And Leases Receivable [Line Items]    
Current 17,803,206 17,511,052
30-89 Days past due 41,516 62,479
Purchased impaired 16,734 17,437
Nonaccrual 144,753 151,908
Total 18,021,812 17,776,953
Commercial [Member]
   
Loans And Leases Receivable [Line Items]    
Current 21,646,755 21,759,997
30-89 Days past due 132,454 118,249
Purchased impaired 110,026 132,962
Nonaccrual 197,987 193,859
Total 22,145,535 22,273,173
Residential Builder and Developer [Member]
   
Loans And Leases Receivable [Line Items]    
Current 796,756 757,311
30-89 Days past due 15,226 35,419
Purchased impaired 151,369 187,764
Nonaccrual 132,621 181,865
Total 1,110,606 1,189,526
Other Commercial Construction [Member]
   
Loans And Leases Receivable [Line Items]    
Current 2,709,159 2,379,953
30-89 Days past due 17,789 35,274
Purchased impaired 78,373 68,971
Nonaccrual 38,514 36,812
Total 2,860,253 2,531,091
Residential [Member]
   
Loans And Leases Receivable [Line Items]    
Current 9,039,263 9,811,956
30-89 Days past due 298,767 337,969
Purchased impaired 35,534 36,769
Nonaccrual 254,033 249,314
Total 9,987,200 10,794,316
Residential Alt-A [Member]
   
Loans And Leases Receivable [Line Items]    
Current 305,693 331,021
30-89 Days past due 21,464 19,692
Purchased impaired      
Nonaccrual 85,392 95,808
Total 412,549 446,521
Home Equity Lines and Loans [Member]
   
Loans And Leases Receivable [Line Items]    
Current 6,039,668 6,199,591
30-89 Days past due 33,205 40,759
Purchased impaired 2,661 3,211
Nonaccrual 70,488 58,071
Total 6,172,637 6,321,950
Automobile [Member]
   
Loans And Leases Receivable [Line Items]    
Current 2,467,882 2,442,502
30-89 Days past due 32,752 40,461
Purchased impaired      
Nonaccrual 20,533 25,107
Total 2,521,335 2,508,321
Other [Member]
   
Loans And Leases Receivable [Line Items]    
Current 2,678,668 2,661,432
30-89 Days past due 35,887 40,599
Purchased impaired      
Nonaccrual 20,585 20,432
Total 2,739,939 2,729,106
Non-Acquired [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 340,467 358,397
Non-Acquired [Member] | Commercial, Financial, Leasing, etc. [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 5,701 23,490
Non-Acquired [Member] | Commercial [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 14,397 13,111
Non-Acquired [Member] | Residential Builder and Developer [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 3,291 3,258
Non-Acquired [Member] | Other Commercial Construction [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 79 509
Non-Acquired [Member] | Residential [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 312,703 313,184
Non-Acquired [Member] | Residential Alt-A [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing      
Non-Acquired [Member] | Home Equity Lines and Loans [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing      
Non-Acquired [Member] | Automobile [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing      
Non-Acquired [Member] | Other [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 4,296 4,845
Acquired [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 155,686 166,554
Acquired [Member] | Commercial, Financial, Leasing, etc. [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 9,902 10,587
Acquired [Member] | Commercial [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 43,916 54,995
Acquired [Member] | Residential Builder and Developer [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 11,343 23,909
Acquired [Member] | Other Commercial Construction [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 16,339 9,572
Acquired [Member] | Residential [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 46,900 45,124
Acquired [Member] | Residential Alt-A [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing      
Acquired [Member] | Home Equity Lines and Loans [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 26,615 20,318
Acquired [Member] | Automobile [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing 168 251
Acquired [Member] | Other [Member]
   
Loans And Leases Receivable [Line Items]    
90 Days or more past due and accruing $ 503 $ 1,798