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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 36,778,401 $ 35,740,489
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans [1] 1,599,227 1,450,556
Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,174,180 1,085,529
Lease financing, unearned income    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 47,492 43,553
Non-Covered Loans 425,047 365,027
Specialty Finance Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,000,000 880,700
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 592,400 $ 569,900
[1] Includes lease financing receivables, all of which were classified as "pass."