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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                              
Numerator (Included in basic and diluted earnings per share) $ 3,436 $ 2,652 $ 2,217 $ 1,794 $ 2,698 $ 2,898 $ 2,881 $ 2,495 $ 2,686 $ 2,833 $ 3,001 $ 2,709 $ 10,099 $ 10,971 $ 11,229
Weighted average common shares outstanding for:                              
Basic earnings per common share                         7,446,000 7,510,000 7,581,000
Dilutive securities:                              
Deferred compensation                         36,000 58,000 84,000
Warrants—Treasury stock method                         20,000 65,000
Diluted common shares outstanding                         7,482,000 7,588,000 7,730,000
Basic earnings per common share $ 0.46 $ 0.36 $ 0.30 $ 0.24 $ 0.36 $ 0.39 $ 0.38 $ 0.33 $ 0.35 $ 0.37 $ 0.40 $ 0.36 $ 1.36 $ 1.46 $ 1.48
Diluted earnings per common share $ 0.46 $ 0.35 $ 0.30 $ 0.24 $ 0.36 $ 0.39 $ 0.37 $ 0.33 $ 0.35 $ 0.37 $ 0.39 $ 0.35 1.35 1.45 1.45
The average market price used in calculating assumed number of shares                         $ 15.89 $ 19.32 $ 23.26