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LOAN PORTFOLIO - Loans Held for Investment on Which Accrual of Interest Income had been Discontinued (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]    
Loans held for sale $ 32,980 $ 50,006
Nonperforming Financing Receivable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans held for sale $ 8,300 $ 8,100