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Loans - Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance $ 136,171 $ 124,881  
Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance   4,957,164  
Loans and Leases receivable, Allowance, Ending Balance 11,577,802 11,177,026  
Ending balance: Individually evaluated for impairment 83,578 50,970 62,454
Ending balance: Collectively evaluated for impairment 11,494,224 11,126,056 4,894,710
Acquired loans   5,617,853  
Loans [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 8,345,688 8,062,158  
Ending balance: Individually evaluated for impairment 80,464 46,243  
Ending balance: Collectively evaluated for impairment 8,265,224 8,015,915  
Acquired loans   4,496,644  
Loans [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 1,577,944 1,507,498  
Ending balance: Individually evaluated for impairment 3,114 4,727  
Ending balance: Collectively evaluated for impairment 1,574,830 1,502,771  
Acquired loans   734,669  
Loans [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 1,654,170 1,607,370  
Ending balance: Collectively evaluated for impairment 1,654,170 1,607,370  
Acquired loans   386,540  
Allowance for loan losses [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 124,881 81,997 66,050
Charge-offs (95,801) (70,263) (58,266)
Recoveries 14,701 24,984 7,584
Net provision for loan losses 54,192 38,732 65,991
Increase in FDIC loss share receivable 38,198 49,431 638
Loans and Leases receivable, Allowance, Ending Balance 136,171 124,881 81,997
Ending balance: Individually evaluated for impairment 7,165 7,539 11,952
Ending balance: Collectively evaluated for impairment 129,006 117,342 70,045
Allowance for loan losses [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 78,414 56,859  
Charge-offs (72,224) (54,754)  
Recoveries 10,269 20,006  
Net provision for loan losses 35,733 29,762  
Increase in FDIC loss share receivable 25,777 26,541  
Loans and Leases receivable, Allowance, Ending Balance 77,969 78,414  
Ending balance: Individually evaluated for impairment 7,165 6,988  
Ending balance: Collectively evaluated for impairment 70,804 71,426  
Allowance for loan losses [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 13,918 4,626  
Charge-offs (6,275) (2,634)  
Recoveries 324 1,091  
Net provision for loan losses 19,411 1,632  
Increase in FDIC loss share receivable 11,702 9,203  
Loans and Leases receivable, Allowance, Ending Balance 39,080 13,918  
Ending balance: Individually evaluated for impairment   551  
Ending balance: Collectively evaluated for impairment 39,080 13,367  
Allowance for loan losses [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 32,549 20,512  
Charge-offs (17,302) (12,875)  
Recoveries 4,108 3,887  
Net provision for loan losses (952) 7,338  
Increase in FDIC loss share receivable 719 13,687  
Loans and Leases receivable, Allowance, Ending Balance 19,122 32,549  
Ending balance: Collectively evaluated for impairment 19,122 32,549  
Originated loans [Member] | Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 7,107,221 4,887,730  
Ending balance: Individually evaluated for impairment 73,276 32,124  
Ending balance: Collectively evaluated for impairment 7,033,945 4,855,606  
Originated loans [Member] | Loans [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 4,927,460 3,325,972  
Ending balance: Individually evaluated for impairment 70,555 28,034  
Ending balance: Collectively evaluated for impairment 4,856,905 3,297,938  
Originated loans [Member] | Loans [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 827,985 487,147  
Ending balance: Individually evaluated for impairment 2,721 4,090  
Ending balance: Collectively evaluated for impairment 825,264 483,057  
Originated loans [Member] | Loans [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 1,351,776 1,074,611  
Ending balance: Collectively evaluated for impairment 1,351,776 1,074,611  
Originated loans [Member] | Allowance for loan losses [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 83,246 81,325  
Charge-offs (64,760) (58,788)  
Recoveries 9,729 24,984  
Net provision for loan losses 50,559 35,725  
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 78,774 83,246  
Ending balance: Individually evaluated for impairment 6,377 7,539  
Ending balance: Collectively evaluated for impairment 72,397 75,707  
Originated loans [Member] | Allowance for loan losses [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 60,211 56,859  
Charge-offs (42,277) (43,654)  
Recoveries 5,375 20,006  
Net provision for loan losses 35,840 27,000  
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 59,149 60,211  
Ending balance: Individually evaluated for impairment 6,377 6,988  
Ending balance: Collectively evaluated for impairment 52,772 53,223  
Originated loans [Member] | Allowance for loan losses [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 4,894 4,626  
Charge-offs (6,275) (2,634)  
Recoveries 324 1,091  
Net provision for loan losses 7,463 1,811  
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 6,406 4,894  
Ending balance: Individually evaluated for impairment   551  
Ending balance: Collectively evaluated for impairment 6,406 4,343  
Originated loans [Member] | Allowance for loan losses [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 18,141 19,840  
Charge-offs (16,208) (12,500)  
Recoveries 4,030 3,887  
Net provision for loan losses 7,256 6,914  
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 13,219 18,141  
Ending balance: Collectively evaluated for impairment 13,219 18,141  
Acquired loans [Member] | Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 3,954,758    
Ending balance: Individually evaluated for impairment 6,202    
Ending balance: Collectively evaluated for impairment 3,948,556    
Acquired loans [Member] | Loans [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 3,265,340    
Ending balance: Individually evaluated for impairment 6,202    
Ending balance: Collectively evaluated for impairment 3,259,138    
Acquired loans [Member] | Loans [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 486,444    
Ending balance: Collectively evaluated for impairment 486,444    
Acquired loans [Member] | Loans [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 202,974    
Ending balance: Collectively evaluated for impairment 202,974    
Acquired loans [Member] | Allowance for loan losses [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net provision for loan losses 788    
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 788    
Ending balance: Individually evaluated for impairment 788    
Ending balance: Collectively evaluated for impairment       
Acquired loans [Member] | Allowance for loan losses [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net provision for loan losses 788    
Increase in FDIC loss share receivable       
Loans and Leases receivable, Allowance, Ending Balance 788    
Ending balance: Individually evaluated for impairment 788    
Ending balance: Collectively evaluated for impairment       
Acquired loans [Member] | Allowance for loan losses [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in FDIC loss share receivable       
Ending balance: Collectively evaluated for impairment       
Acquired loans [Member] | Allowance for loan losses [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Increase in FDIC loss share receivable       
Ending balance: Collectively evaluated for impairment       
Covered loans [Member] | Loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 515,823 671,443  
Ending balance: Individually evaluated for impairment 4,100 18,846  
Ending balance: Collectively evaluated for impairment 511,723 652,597 809,200
Covered loans [Member] | Loans [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 152,888 239,542  
Ending balance: Individually evaluated for impairment 3,707 18,209  
Ending balance: Collectively evaluated for impairment 149,181 221,333  
Covered loans [Member] | Loans [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 263,515 285,682  
Ending balance: Individually evaluated for impairment 393 637  
Ending balance: Collectively evaluated for impairment 263,122 285,045  
Covered loans [Member] | Loans [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Ending Balance 99,420 146,219  
Ending balance: Collectively evaluated for impairment 99,420 146,219  
Covered loans [Member] | Allowance for loan losses [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 41,635 672  
Charge-offs (31,041) (11,475)  
Recoveries 4,972    
Net provision for loan losses 2,845 3,007  
Increase in FDIC loss share receivable 38,198 49,431  
Loans and Leases receivable, Allowance, Ending Balance 56,609 41,635  
Ending balance: Individually evaluated for impairment        
Ending balance: Collectively evaluated for impairment 56,609 41,635  
Covered loans [Member] | Allowance for loan losses [Member] | Commercial loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 18,203    
Charge-offs (29,947) (11,100)  
Recoveries 4,894    
Net provision for loan losses (895) 2,762  
Increase in FDIC loss share receivable 25,777 26,541  
Loans and Leases receivable, Allowance, Ending Balance 18,032 18,203  
Ending balance: Individually evaluated for impairment        
Ending balance: Collectively evaluated for impairment 18,032 18,203  
Covered loans [Member] | Allowance for loan losses [Member] | Residential mortgage loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 9,024    
Net provision for loan losses 11,948 (179)  
Increase in FDIC loss share receivable 11,702 9,203  
Loans and Leases receivable, Allowance, Ending Balance 32,674 9,024  
Ending balance: Individually evaluated for impairment        
Ending balance: Collectively evaluated for impairment 32,674 9,024  
Covered loans [Member] | Allowance for loan losses [Member] | Consumer loans [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases receivable, Allowance, Beginning Balance 14,408 672  
Charge-offs (1,094) (375)  
Recoveries 78    
Net provision for loan losses (8,208) 424  
Increase in FDIC loss share receivable 719 13,687  
Loans and Leases receivable, Allowance, Ending Balance 5,903 14,408  
Ending balance: Individually evaluated for impairment        
Ending balance: Collectively evaluated for impairment $ 5,903 $ 14,408