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Composition of Loan Portfolio (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 38,859,854 $ 38,359,022
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans [1] 2,035,030 2,040,574
Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,377,766 1,377,964
Lease financing, unearned income    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned income 61,251 65,041
Non-Covered Loans 657,264 662,610
Specialty Finance Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans 1,500,000 1,500,000
Other Commercial and Industrial Loans | Commercial and Industrial | Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-Covered Loans $ 522,000 $ 500,800
[1] Includes lease financing receivables, all of which were classified as Pass.