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Additional Information Regarding Methods used to Evaluate Loan Portfolio for Impairment (Detail) - Additional Information Loan Portfolio - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment $ 37,212 $ 51,954
Loans Receivable, Collectively evaluated for impairment 37,292,390 35,680,191
Total loans, net 39,124,705 37,800,578
Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,795,103 2,068,433
Mortgage Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 24,162 47,480
Loans Receivable, Collectively evaluated for impairment 35,510,354 34,209,870
Total loans, net 37,227,932 36,181,605
Mortgage Receivable | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,693,416 1,924,255
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 13,050 4,474
Loans Receivable, Collectively evaluated for impairment 1,782,036 1,470,321
Total loans, net 1,896,773 1,618,973
Other loans | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other $ 101,687 $ 144,178