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STOCK-BASED COMPENSATION PLANS - Stock Incentive Plans and Restricted Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
STOCK-BASED COMPENSATION      
Shares of common stock available for grant under stock incentive plans 1,031,128    
Additional disclosures      
Stock based compensation expense, net of forfeitures $ 4,161 $ 3,550 $ 3,203
Restricted Stock      
STOCK-BASED COMPENSATION      
Weighted average grant date fair value (in dollars per share) $ 32.06 $ 22.34 $ 27.97
Service period over which value of the shares is amortized to compensation expense 3 years    
Number of Non-vested Restricted Shares      
Outstanding at beginning of period (in shares) 357,342 280,053 233,613
Awarded (in shares) 109,462 240,656 164,295
Vested (in shares) (162,419) (159,698) (113,106)
Forfeited (in shares) (10,808) (3,669) (4,749)
Outstanding at end of period (in shares) 293,577 357,342 280,053
Additional disclosures      
Stock based compensation expense, net of forfeitures $ 4,161 $ 3,550 $ 3,203
Unrecognized compensation expense 6,555    
Unrecognized compensation expense, expected to be recognized in next fiscal year $ 5,155    
Restricted Stock | Minimum      
STOCK-BASED COMPENSATION      
Service period of earned grants 3 years    
Restricted Stock | Maximum      
STOCK-BASED COMPENSATION      
Service period of earned grants 5 years    
Restricted Stock | Performance based vesting      
Number of Non-vested Restricted Shares      
Outstanding at beginning of period (in shares) 89,010 38,214  
Awarded (in shares) 63,432 150,605 115,316
Performance criteria met (in shares) (42,290) (96,576) (76,278)
Forfeited (in shares) (10,229) (3,233) (824)
Outstanding at end of period (in shares) 99,923 89,010 38,214