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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SHARE-BASED COMPENSATION                      
Net income $ 22,327 $ 20,815 $ 18,714 $ 18,038 $ 12,171 $ 6,859 $ 9,917 $ 8,326 $ 79,894 $ 37,273 $ 58,322
Weighted average shares outstanding - basic (in shares)                 28,003,744 28,074,543 28,495,699
Weighted average shares outstanding - diluted (in shares)                 28,257,323 28,180,576 28,677,100
Basic earnings per share (in dollars per share) $ 0.80 $ 0.74 $ 0.66 $ 0.64 $ 0.43 $ 0.24 $ 0.35 $ 0.30 $ 2.85 $ 1.33 $ 2.05
Diluted earnings per share (in dollars per share) $ 0.80 $ 0.74 $ 0.66 $ 0.64 $ 0.43 $ 0.24 $ 0.35 $ 0.29 $ 2.83 $ 1.32 $ 2.03
Antidilutive securities excluded from the dilutive share calculation (in shares)                 0 0 0
Stock Option                      
SHARE-BASED COMPENSATION                      
Dilutive effect of share-based compensation arrangements (in shares)                 253,579 106,033 181,401