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STOCK BASED COMPENSATION - NONVESTED SHARES (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
2005 Restricted Stock Grant Plan | Restricted stock    
Stock Based Compensation    
Number of shares authorized for issuance 100,000  
Shares available for issuance 0  
Shares    
Nonvested at the beginning of the period (in shares) 5,924  
Granted (in shares) 0 0
Vested (in shares) (4,254)  
Forfeited (in shares) (90) (178)
Nonvested at the end of the period (in shares) 1,580 5,924
Weighted-Average Grant-Date Fair Value    
Nonvested shares, balance at the beginning of the period (in dollars) $ 77,404  
Vested (in dollars) (54,566)  
Forfeited (in dollars) (1,232)  
Nonvested shares, balance at the end of the period (in dollars) $ 21,606 $ 77,404
Fair Value Per Share    
Nonvested shares, balance at the beginning of the period (in dollars per share) $ 13.07  
Vested (in dollars per share) 12.83  
Forfeited (in dollars per share) 13.69  
Nonvested shares, balance at the end of the period (in dollars per share) $ 13.67 $ 13.07
Additional disclosures    
Fair value of shares vested (in dollars) $ 55,000 $ 72,000
2009 Stock Award Plan    
Stock Based Compensation    
Number of shares authorized for issuance 300,000  
Shares    
Nonvested at the beginning of the period (in shares) 25,778  
Granted (in shares) 23,380 11,440
Vested (in shares) (9,242)  
Forfeited (in shares) (1,434) (2,226)
Nonvested at the end of the period (in shares) 38,482 25,778
Weighted-Average Grant-Date Fair Value    
Nonvested shares, balance at the beginning of the period (in dollars) $ 482,213  
Granted (in dollars) 549,430  
Vested (in dollars) (175,749)  
Forfeited (in dollars) (29,960)  
Nonvested shares, balance at the end of the period (in dollars) $ 825,935 $ 482,213
Fair Value Per Share    
Nonvested shares, balance at the beginning of the period (in dollars per share) $ 18.71  
Granted (in dollars per share) 23.50  
Vested (in dollars per share) 19.02  
Forfeited (in dollars per share) 20.89  
Nonvested shares, balance at the end of the period (in dollars per share) $ 21.46 $ 18.71
Additional disclosures    
Period over which cost is expected to be recognized 3 years 6 months  
Fair value of shares vested (in dollars) $ 176,000 $ 81,000
2019 Stock Award Plan    
Stock Based Compensation    
Number of shares authorized for issuance 300,000  
Shares    
Granted (in shares) 0