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LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Recorded investment in non-accrual loans by class (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans   $ 13,112 $ 3,006
Number of loans classified as TDRs | loan 1    
Recorded investments   1,800 1,800
Cash, Securities and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans   $ 11,277  
1-4 Family Residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans     $ 1,171
Number of loans classified as TDRs | loan   1 1
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-accrual loans   $ 1,835 $ 1,835