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EARNINGS PER SHARE (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Basic    
Net income $ 25,076 $ 19,021
Less: Earnings allocated to participating securities (84) (25)
Net income available to common stockholders $ 24,992 $ 18,996
Weighted average common shares outstanding including participating securities 11,081,924 10,934,091
Less: Weighted average participating securities (37,300) (14,223)
Weighted average common shares outstanding 11,044,624 10,919,868
Basic earnings (in dollars per share) $ 2.26 $ 1.74
Diluted    
Net income allocated to common shareholders $ 24,992 $ 18,996
Weighted average common shares outstanding for basic earnings per common share 11,044,624 10,919,868
Average shares and dilutive potential common shares 11,103,008 11,223,294
Diluted earnings (in dollars per share) $ 2.25 $ 1.69
Stock Option    
Diluted    
Add: Dilutive effects of assumed exercise of stock options   190,826
Performance-Based Restricted Stock Units (PRSUs)    
Diluted    
Dilutive effects of assumed vesting units 58,384 73,561
Restricted stock awards    
Calculations of basic and diluted earnings per share    
Number of antidilutive shares not considered in computing diluted earnings per share 262,624  
Diluted    
Dilutive effects of assumed vesting units   39,039