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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 37,225,844 $ 37,356,201
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans [1] 2,030,482 1,900,445
Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,485,487 1,341,216
Lease financing, unearned income    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 56,205 60,278
Non-Covered Loans 544,995 559,229
Specialty Finance Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,500,000 1,300,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 566,400 $ 632,900
[1] Includes lease financing receivables, all of which were classified as "pass."