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STOCK PLANS AND STOCK BASED COMPENSATION - ACTIVITY (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Information related to the stock option plan      
Total cash received from options exercised, net of shares redeemed $ (2,000) $ 52,000 $ (142,000)
Information related to stock option and restricted stock awards granted      
Expenses 1,322,000 $ 1,649,000 $ 1,441,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2024 1,541,000    
2025 1,107,000    
2026 557,000    
2027 13,000    
Total $ 3,218,000    
Employee Stock Option [Member]      
Weighted average assumptions used to determined fair value of stock options granted      
Risk-free interest rate (as a percent) 3.86% 1.35% 0.20%
Expected dividend yield (as a percent) 3.19% 2.50% 3.18%
Expected stock price volatility (as a percent) 33.14% 32.12% 31.71%
Expected life of options (in years) 4 years 4 years 4 years
Estimated fair value per share of options granted (in dollars per share) $ 9.65 $ 10.41 $ 6.26
Options      
Outstanding, beginning of year (in shares) 465,033 460,502  
Granted (in shares) 69,617 54,281  
Exercised (in shares) (10,000) (5,250)  
Forfeited or expired (in shares) (64,000) (44,500)  
Outstanding, end of year (in shares) 460,650 465,033 460,502
Unvested (in shares) 287,148    
Exercisable (vested) at end of year (in shares) 173,502    
Weighted Average Exercise Price      
Outstanding, beginning of year (in dollars per share) $ 38.81 $ 37.54  
Granted (in dollars per share) 42.74 50.34  
Exercised (in dollars per share) 46.08 34.17  
Forfeited or expired (in dollars per share) 45.09 40.32  
Outstanding, end of year (in dollars per share) 38.37 $ 38.81 $ 37.54
Unvested (in dollars per share) 38.76    
Exercisable (vested) at end of year (in dollars per share) $ 37.72    
Weighted Average Remaining Contractual Term (years)      
Outstanding, end of year 1 year 10 months 13 days 2 years 3 months  
Unvested 2 years 5 months 1 day    
Exercisable (vested) at end of year 11 months 15 days    
Aggregate Intrinsic Value      
Outstanding, end of year $ 7,734,879 $ 2,322,635  
Unvested 4,708,333    
Exercisable (vested) at end of year 3,026,546    
Information related to the stock option plan      
Total intrinsic value of options exercised 58,000 57,000 $ 1,335,000
Total cash received from options exercised, net of shares redeemed (2,000) 52,000 (142,000)
Total tax benefit of options exercised 1,000 6,000 223,000
Information related to stock option and restricted stock awards granted      
Expenses 774,000 560,000 $ 574,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2024 489,000    
2025 263,000    
2026 18,000    
2027 5,000    
Total 775,000    
Employee Stock Option [Member] | Non-executive officer employees | Related Party [Member]      
Information related to the stock option plan      
Outstanding loans $ 129,000 $ 178,000  
Restricted Stock Awards      
Shares      
Outstanding, beginning of year (in shares) 64,733 56,059  
Granted (in shares) 55,157 12,174  
Forfeited (in shares) (1,470)    
Earned and issued (in shares) (31,354) (3,500)  
Outstanding, end of year (in shares) 87,066 64,733 56,059
Unvested and Expected to vest (in shares) 87,066    
Weighted-average grant date fair value      
Outstanding, beginning of year (in dollars per share) $ 40.49 $ 39.12  
Granted (in dollars per share) 43.60 46.05  
Forfeited (in dollars per share) 49.08    
Earned and issued (in dollars per share) 37.56 37.74  
Outstanding, end of year (in dollars per share) 43.37 $ 40.49 $ 39.12
Unvested and Expected to vest (in dollars per share) $ 43.37    
Other than option, Weighted-Average Remaining Contractual Term (years)      
Outstanding, end of year 1 year 11 months 23 days 2 years 3 months  
Information related to stock option and restricted stock awards granted      
Total fair value of shares vested $ 1,500,000 $ 186,000 $ 50,000
Expenses 829,000 $ 937,000 738,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2024 1,052,000    
2025 844,000    
2026 539,000    
2027 8,000    
Total $ 2,443,000    
Restricted Stock Awards | Minimum      
Shares      
Unrecognized compensation expense recognition period 3 years    
Restricted Stock Awards | Maximum      
Shares      
Unrecognized compensation expense recognition period 6 years    
Performance Stock Units      
Shares      
Granted (in shares) 10,999 8,874  
Forfeited (in shares) (10,999) (8,874)  
Weighted-average grant date fair value      
Granted (in dollars per share) $ 42.74 $ 51.39  
Forfeited (in dollars per share) $ 42.74 $ 51.39  
Information related to stock option and restricted stock awards granted      
Expenses $ (281,000) $ 152,000 $ 129,000