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Note Loans (Loans held-for-sale in non-performing status) (Detail) - Loans Held-for-Sale - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual loans $ 0 $ 45,169
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual loans 0 45,074
Construction    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual loans $ 0 $ 95