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Additional Information Regarding Methods used to Evaluate Loan Portfolio for Impairment (Detail) - Additional Information Loan Portfolio - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment $ 71,210 $ 48,252
Loans Receivable, Collectively evaluated for impairment 37,149,228 37,302,187
Total loans, net 37,225,844 39,054,334
Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 5,406 1,703,895
Mortgage Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 21,549 29,660
Loans Receivable, Collectively evaluated for impairment 35,164,278 35,402,029
Total loans, net 35,190,422 37,046,444
Mortgage Receivable | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 4,595 1,614,755
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 49,661 18,592
Loans Receivable, Collectively evaluated for impairment 1,984,950 1,900,158
Total loans, net 2,035,422 2,007,890
Other loans | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other $ 811 $ 89,140