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EARNINGS PER SHARE - Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Basic EPS computation:                      
Numerator-net income (in dollars) $ 3,414 $ 4,035 $ 2,543 $ 480 $ 2,894 $ 4,128 $ 4,534 $ 4,192 $ 10,472 $ 15,748 $ 17,266
Denominator-weighted average common shares outstanding                 22,296,195 22,707,624 22,588,395
Basic EPS (in dollars per share) $ 0.15 [1] $ 0.18 [1] $ 0.11 [1] $ 0.02 [1] $ 0.13 [1] $ 0.18 [1] $ 0.20 [1] $ 0.19 [1] $ 0.47 $ 0.69 $ 0.76
Diluted EPS computation:                      
Numerator-net income (in dollars) $ 3,414 $ 4,035 $ 2,543 $ 480 $ 2,894 $ 4,128 $ 4,534 $ 4,192 $ 10,472 $ 15,748 $ 17,266
Denominator-weighted average common shares outstanding                 22,296,195 22,707,624 22,588,395
Effect of dilutive stock options                 17,000 36,000 72,000
Weighted average common shares and common stock equivalents                 22,312,831 22,744,045 22,659,594
Diluted EPS (in dollars per share) $ 0.15 [1] $ 0.18 [1] $ 0.11 [1] $ 0.02 [1] $ 0.13 [1] $ 0.18 [1] $ 0.20 [1] $ 0.18 [1] $ 0.47 $ 0.69 $ 0.76
[1] Quarterly earnings per common share may vary from annual earnings per common share due to rounding.