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SHAREHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE - Earnings Per 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, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity [Abstract]                      
Net income $ 8,640 $ 8,402 $ 8,481 $ 7,721 $ 4,207 $ 5,015 $ 6,117 $ 7,281 $ 33,244 $ 22,620 $ 32,937
Average number of basic common shares outstanding (in shares) 14,909,000 15,079,000 15,424,000 15,558,000 15,554,000 15,547,000 15,538,000 15,523,000 15,245,728 15,540,884 15,487,686
Plus: dilutive effect of stock options and awards outstanding (in shares)                 25,819 46,109 76,778
Average number of diluted common shares outstanding (in shares) 14,952,000 15,103,000 15,441,000 15,593,000 15,602,000 15,581,000 15,586,000 15,587,000 15,271,547 15,586,993 15,564,464
Anti-dilutive options excluded from earnings calculation (in shares)                     7,991
Earnings per share:                      
Basic (in dollars per share) $ 0.58 $ 0.56 $ 0.55 $ 0.50 $ 0.27 $ 0.32 $ 0.39 $ 0.47 $ 2.18 $ 1.46 $ 2.13
Diluted (in dollars per share) $ 0.58 $ 0.56 $ 0.55 $ 0.50 $ 0.27 $ 0.32 $ 0.39 $ 0.47 $ 2.18 $ 1.45 $ 2.12