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Additional Information Regarding Methods used to Evaluate Loan Portfolio for Impairment (Detail) - Additional Information Loan Portfolio - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment $ 48,252 $ 51,954
Loans Receivable, Collectively evaluated for impairment 37,302,187 35,680,191
Total loans, net 39,054,334 37,800,578
Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,703,895 2,068,433
Mortgage Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 29,660 47,480
Loans Receivable, Collectively evaluated for impairment 35,402,029 34,209,870
Total loans, net 37,046,444 36,181,605
Mortgage Receivable | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,614,755 1,924,255
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 18,592 4,474
Loans Receivable, Collectively evaluated for impairment 1,900,158 1,470,321
Total loans, net 2,007,890 1,618,973
Other loans | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other $ 89,140 $ 144,178