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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, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment $ 51,954 $ 88,380
Loans Receivable, Collectively evaluated for impairment 35,680,191 32,915,981
Total loans, net 37,800,578 35,432,983
Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 2,068,433 2,428,622
Mortgage Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 47,480 81,574
Loans Receivable, Collectively evaluated for impairment 34,209,870 31,781,623
Total loans, net 36,181,605 34,090,769
Mortgage Receivable | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,924,255 2,227,572
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 4,474 6,806
Loans Receivable, Collectively evaluated for impairment 1,470,321 1,134,358
Total loans, net 1,618,973 1,342,214
Other loans | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other $ 144,178 $ 201,050