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STOCK COMPENSATION (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock            
Shares [Roll Forward]            
Nonvested, beginning of period (in shares) 31,830 33,575   33,575    
Granted (in shares)       14,805    
Vested (in shares)       (16,438)    
Forfeited or cancelled (in shares)       (112)    
Nonvested, end of period (in shares)       31,830 33,575  
Weighted-Average Grant Date Fair Value [Roll Forward]            
Nonvested, beginning of period (in dollars per share) $ 40.32 $ 43.24   $ 43.24    
Granted (in dollars per share)       35.21    
Vested (in dollars per share)       41.65    
Forfeitures or cancelled (in dollars per share)       44.72    
Nonvested, end of period (in dollars per share)       $ 40.32 $ 43.24  
Total unrecognized compensation cost related to nonvested shares granted under the Plan       $ 1,100,000    
Weighted-average period for recognition (in years)       3 years 10 months 17 days    
Total fair value of shares vested       $ 556,000 $ 438,000 $ 432,000
Director            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Increase in annual cash retainer paid         6,000  
Annual cash retainer paid to individuals         11,500  
Board of Directors Chairman            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Annual cash retainer paid to individuals         19,250  
Audit Committee Chairman            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Increase in annual cash retainer paid         2,875  
Annual cash retainer paid to individuals         $ 14,375  
President and Chief Executive Officer            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Service period (months)         12 months  
Directors and President and Chief Executive Officer            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Number of treasury shares reissued to fund stock compensation (in shares)   7,923 8,465      
Expense related to stock compensation recognized       $ 318,000 $ 350,000 $ 357,000
Subsequent Event | Directors and President and Chief Executive Officer            
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]            
Number of treasury shares reissued to fund stock compensation (in shares) 9,291