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LOANS AND ALLOWANCE FOR LOAN LOSSES (Troubled Debt Restructurings) (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Contract
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Financing Receivable, Modifications [Line Items]      
Number of loans moved to nonaccrual status 2    
Number of troubled debt restructured loans with a specific allocation   1  
Amount of specific allocation | $   $ 60,000  
Number of troubled debt restructured loan paid off   1 1
Number of loans which has periodic payments   1  
Number of loans classified as troubled debt restructured loans with active forbearance agreements   1  
Mortgage loans in process of foreclosure | $   $ 848,000 $ 471,000
Entity Loan Modification Program      
Financing Receivable, Modifications [Line Items]      
Proceeds from paid off troubled debt restructured loans | $   $ 283,000 $ 74,000