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EARNINGS PER SHARE - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
EARNINGS PER SHARE        
Average common shares outstanding 13,710 14,084 13,713 14,153
Net income and net income available to common stockholders $ 20,114 $ 13,203 $ 38,982 $ 28,071
Per common share amount $ 1.47 $ 0.94 $ 2.84 $ 1.98
Average common shares outstanding 13,710 14,084 13,713 14,153
Net effect of dilutive stock options - based on the treasury stock method using average market price 102 40 94 56
Diluted common shares 13,812 14,124 13,807 14,209
Net income and net income available to common stockholders $ 20,114 $ 13,203 $ 38,982 $ 28,071
Per common share amount $ 1.46 $ 0.93 $ 2.82 $ 1.98