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LOANS AND ALLOWANCE FOR LOAN LOSSES - TDR Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
SecurityLoan
contract
Mar. 31, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
SecurityLoan
Financing Receivable Modifications [Line Items]      
Number of contracts 16   18
Recorded investment or loans under troubled debt restructurings | $ $ 1,600,000   $ 1,600,000
Number of loans modified | contract 0 0  
Loans modified under troubled debt restructurings during previous twelve month period that subsequently defaulted | $ $ 0 $ 0  
Troubled Debt Restructuring, Adjustments to Maturity [Member]      
Financing Receivable Modifications [Line Items]      
Number of contracts 7    
Troubled Debt Restructuring, Reduction in Interest Rate [Member]      
Financing Receivable Modifications [Line Items]      
Number of contracts 8    
Nonaccrual [Member]      
Financing Receivable Modifications [Line Items]      
Number of contracts 1