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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 37,304,853 $ 37,356,201
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans [1] 1,911,635 1,900,445
Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,348,391 1,341,216
Lease financing, unearned income    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 57,365 60,278
Non-Covered Loans 563,244 559,229
Specialty Finance Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,300,000 1,300,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 629,600 $ 632,900
[1] Includes lease financing receivables, all of which were classified as "pass."