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FAIR VALUE - Fair value hierarchy of financial instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financial assets - Carrying Amount        
Cash and cash equivalents $ 8,528 $ 12,605 $ 17,330 $ 10,622
Loans receivable, net 272,817 269,023    
Cash value of life insurance 8,290      
Financial liabilities - Carrying Amount        
Deposits 336,170 334,238    
Short-term debt 20,000 20,000    
Financial assets - Fair Value        
Loans receivable, net 271,053 275,819    
Financial liabilities - Fair Value        
Deposits 315,964 324,512    
Short-term debt 20,781 $ 20,739    
Fair Value        
Financial assets - Fair Value        
Cash and cash equivalents 8,290      
Loans receivable, net 271,053      
Cash value of life insurance 8,528      
Financial liabilities - Fair Value        
Deposits 20,781      
Short-term debt 315,964      
Fair Value | Level 1        
Financial assets - Fair Value        
Cash value of life insurance 8,528      
Financial liabilities - Fair Value        
Short-term debt 224,098      
Fair Value | Level 2        
Financial assets - Fair Value        
Cash and cash equivalents 8,290      
Financial liabilities - Fair Value        
Deposits 20,781      
Short-term debt 91,866      
Fair Value | Level 3        
Financial assets - Fair Value        
Loans receivable, net $ 271,053