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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Risk ratings of loans by categories of loans (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]        
Total $ 275,716,000 $ 271,612,000    
Non-accrual 5,441,000 3,270,000 $ 3,772,000 $ 3,751,000
Troubled debt restructures 260,000 263,000    
Troubled debt restructures $ 260,000 $ 263,000    
Number of TDRs accounts | loan 2 2    
Non-performing TDRs | loan 46 46    
Number of non-performing TDRs accounts | loan 1 1    
Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 273,763,000 $ 269,217,000    
Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,200,000 1,776,000    
Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 657,000 554,000    
Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Total 96,000 65,000    
Consumer        
Financing Receivable, Recorded Investment [Line Items]        
Total 15,730,000 16,112,000    
Non-accrual 151,000 185,000 395,000 403,000
Troubled debt restructures 46,000      
Troubled debt restructures $ 46,000 $ 46,000    
Number of TDRs accounts | loan 1 1    
Non-performing TDRs | loan 46 46    
Number of non-performing TDRs accounts | loan 1 1    
Consumer | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 15,574,000 $ 16,008,000    
Consumer | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 97,000 77,000    
Consumer | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 14,000 3,000    
Consumer | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Total 45,000 24,000    
Residential Real estate        
Financing Receivable, Recorded Investment [Line Items]        
Total 82,151,000 81,926,000    
Non-accrual 2,290,000 2,124,000 2,342,000 2,508,000
Residential Real estate | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 81,612,000 81,346,000    
Residential Real estate | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 217,000 344,000    
Residential Real estate | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 322,000 236,000    
Indirect        
Financing Receivable, Recorded Investment [Line Items]        
Total 90,278,000 85,186,000    
Non-accrual 144,000 88,000 180,000 193,000
Indirect | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 89,345,000 83,803,000    
Indirect | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 561,000 1,027,000    
Indirect | Substandard        
Financing Receivable, Recorded Investment [Line Items]        
Total 321,000 315,000    
Indirect | Doubtful        
Financing Receivable, Recorded Investment [Line Items]        
Total 51,000 41,000    
Commercial        
Financing Receivable, Recorded Investment [Line Items]        
Total 11,176,000 11,257,000    
Non-accrual 48,000 48,000    
Troubled debt restructures 214,000      
Troubled debt restructures $ 214,000 $ 217,000    
Number of TDRs accounts | loan 1 1    
Commercial | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 11,175,000 $ 11,256,000    
Commercial | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total 1,000 1,000    
Construction        
Financing Receivable, Recorded Investment [Line Items]        
Total 4,385,000 3,536,000    
Non-accrual 318,000 318,000 170,000  
Construction | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 4,385,000 3,536,000    
Commercial Real Estate        
Financing Receivable, Recorded Investment [Line Items]        
Total 71,996,000 73,595,000    
Non-accrual 2,490,000 507,000 $ 685,000 $ 647,000
Commercial Real Estate | Pass        
Financing Receivable, Recorded Investment [Line Items]        
Total 71,672,000 73,268,000    
Commercial Real Estate | Special mention        
Financing Receivable, Recorded Investment [Line Items]        
Total $ 324,000 $ 327,000