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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Risk ratings of loans by categories of loans (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]        
Total $ 294,981,000 $ 271,612,000    
Non-accrual 2,162,000 3,270,000 $ 3,866,000 $ 3,751,000
Troubled debt restructures 252,000 263,000    
Troubled debt restructures $ 252,000 $ 263,000    
Number of TDRs accounts | loan 2 2    
Non-performing TDRs | loan 44 46    
Number of non-performing TDRs accounts | loan 1 1    
Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 291,265,000 $ 266,320,000    
Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 219,000 674,000    
Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 3,477,000 4,518,000    
Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Total 20,000 100,000    
Consumer        
Financing Receivable, Recorded Investment [Line Items]        
Total 14,602,000 16,112,000    
Non-accrual 334,000 185,000 281,000 403,000
Troubled debt restructures 44,000      
Troubled debt restructures $ 44,000 $ 46,000    
Number of TDRs accounts | loan 1 1    
Non-performing TDRs | loan 44 46    
Number of non-performing TDRs accounts | loan 1 1    
Consumer | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 14,191,000 $ 15,952,000    
Consumer | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 411,000 160,000    
Residential Real estate        
Financing Receivable, Recorded Investment [Line Items]        
Total 82,705,000 81,926,000    
Non-accrual 933,000 2,124,000 2,714,000 2,508,000
Residential Real estate | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 81,142,000 79,126,000    
Residential Real estate | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 172,000 218,000    
Residential Real estate | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,391,000 2,582,000    
Indirect        
Financing Receivable, Recorded Investment [Line Items]        
Total 110,192,000 85,186,000    
Non-accrual 135,000 88,000 193,000 193,000
Indirect | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 109,785,000 84,574,000    
Indirect | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 47,000 129,000    
Indirect | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 340,000 383,000    
Indirect | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Total 20,000 100,000    
Commercial        
Financing Receivable, Recorded Investment [Line Items]        
Total 13,266,000 11,257,000    
Non-accrual   48,000 48,000  
Troubled debt restructures 208,000      
Troubled debt restructures $ 208,000 $ 217,000    
Number of TDRs accounts | loan 1 1    
Commercial | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 13,058,000 $ 11,040,000    
Commercial | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 208,000 217,000    
Construction        
Financing Receivable, Recorded Investment [Line Items]        
Total 2,677,000 3,536,000    
Non-accrual 228,000 318,000    
Construction | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 2,677,000 3,536,000    
Commercial Real Estate        
Financing Receivable, Recorded Investment [Line Items]        
Total 71,539,000 73,595,000    
Non-accrual 532,000 507,000 $ 632,000 $ 647,000
Commercial Real Estate | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 70,412,000 72,092,000    
Commercial Real Estate | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total   327,000    
Commercial Real Estate | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 1,127,000 $ 1,176,000