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LOAN PORTFOLIO - Activity for Specific Reserve (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Specific Reserve:        
Balance at beginning of period $ 49,514 $ 40,794 $ 51,410 $ 64,421
Provision for loan losses 21,821 13,819 50,277 50,014
Financing Receivable Allowance For Credit Losses Net Write Offs Impaired Loans (18,022) (6,458) (48,374) (66,280)
Ending balance: specific reserve for impaired loans $ 53,313 $ 48,155 $ 53,313 $ 48,155