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Additional Information Regarding Methods used to Evaluate Loan Portfolio for Impairment (Detail) - Additional Information Loan Portfolio - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment $ 36,134 $ 51,954
Loans Receivable, Collectively evaluated for impairment 36,111,060 35,680,191
Total loans, net 38,139,722 37,800,578
Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,992,528 2,068,433
Mortgage Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 27,063 47,480
Loans Receivable, Collectively evaluated for impairment 34,586,993 34,209,870
Total loans, net 36,473,542 36,181,605
Mortgage Receivable | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other 1,859,486 1,924,255
Other loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Individually evaluated for impairment 9,071 4,474
Loans Receivable, Collectively evaluated for impairment 1,524,067 1,470,321
Total loans, net 1,666,180 1,618,973
Other loans | Acquired loans with deteriorated credit quality    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, other $ 133,042 $ 144,178