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STOCK PLANS AND STOCK BASED COMPENSATION - ACTIVITY (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Information related to the stock option plan      
Cash received from options exercised, net of shares redeemed $ (191,000) $ 83,000 $ 68,000
Information related to stock option and restricted stock awards granted      
Expenses 1,035,000 $ 1,001,000 $ 1,142,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2020 565,000    
2021 538,000    
2022 477,000    
2023 225,000    
2024 21,000    
Total $ 1,826,000    
Stock option      
Weighted average assumptions used to determined fair value of stock options granted      
Risk-free interest rate (as a percent) 1.85% 3.00% 2.07%
Expected dividend yield (as a percent) 2.25% 2.01% 2.41%
Expected stock price volatility (as a percent) 20.11% 18.59% 20.36%
Expected life of options 5 years 5 years 5 years
Estimated fair value per share of options granted (in dollars per share) $ 7.12 $ 8.09 $ 5.46
Options      
Outstanding, beginning of year (in shares) 433,200 295,000  
Granted (in shares) 5,500 165,000  
Exercised (in shares) (100,600) (3,500)  
Forfeited or expired (in shares) (26,650) (23,300)  
Outstanding, end of year (in shares) 311,450 433,200 295,000
Unvested (in shares) 255,650    
Exercisable (vested) at end of year (in shares) 55,800    
Weighted Average Exercise Price      
Outstanding, beginning of year (in dollars per share) $ 33.50 $ 24.68  
Granted (in dollars per share) 47.02 48.08  
Exercised (in dollars per share) 24.50 24.10  
Forfeited or expired (in dollars per share) 36.00 26.51  
Outstanding, end of year (in dollars per share) 36.43 $ 33.50 $ 24.68
Unvested (in dollars per share) 38.91    
Exercisable (vested) at end of year (in dollars per share) $ 25.08    
Weighted Average Remaining Contractual Term      
Outstanding, end of year 2 years 8 months 23 days 3 years 1 month 24 days  
Unvested 3 years 1 month 24 days    
Exercisable (vested) at end of year 9 months 7 days    
Aggregate Intrinsic Value      
Outstanding, end of year $ 3,449,454 $ 3,786,820  
Unvested 2,235,562    
Exercisable (vested) at end of year 1,213,892    
Information related to the stock option plan      
Intrinsic value of options exercised 2,249,000 79,000 $ 71,000
Cash received from options exercised, net of shares redeemed (191,000) 83,000 68,000
Information related to stock option and restricted stock awards granted      
Expenses 364,000 265,000 $ 227,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2020 304,000    
2021 277,000    
2022 240,000    
2023 106,000    
2024 5,000    
Total 932,000    
Stock option | Non-executive officer employees      
Information related to the stock option plan      
Outstanding loans $ 355,000 $ 133,000  
Restricted Stock Awards      
Shares      
Outstanding, beginning of year (in shares) 51,110 41,610  
Granted (in shares) 2,336 48,323  
Forfeited (in shares)   (1,500)  
Earned and issued (in shares) (12,336) (37,323)  
Outstanding, end of year (in shares) 41,110 51,110 41,610
Vested (in shares) 41,110    
Weighted-average grant date fair value      
Outstanding, beginning of year (in dollars per share) $ 39.06 $ 21.18  
Granted (in dollars per share) 49.34 40.16  
Forfeited (in dollars per share)   19.85  
Earned and issued (in dollars per share) 46.63 21.33  
Outstanding, end of year (in dollars per share) 37.37 $ 39.06 $ 21.18
Unvested and Expected to vest (in dollars per share) $ 37.37    
Information related to stock option and restricted stock awards granted      
Vesting period 6 years    
Expenses $ 728,000 $ 630,000 $ 424,000
Estimated unrecognized stock option and restricted stock award expense related to unvested options and awards (net of estimated forfeitures)      
2020 261,000    
2021 261,000    
2022 237,000    
2023 119,000    
2024 16,000    
Total $ 894,000    
Restricted Stock Awards | Minimum      
Shares      
Unrecognized compensation expense recognition period 5 years    
Restricted Stock Awards | Maximum      
Shares      
Unrecognized compensation expense recognition period 6 years    
Performance Stock Units      
Shares      
Outstanding, beginning of year (in shares) 46,000 48,500  
Forfeited (in shares)   (2,500)  
Earned and issued (in shares) (23,000)    
Outstanding, end of year (in shares) 23,000 46,000 48,500
Vested (in shares) 23,000    
Weighted-average grant date fair value      
Outstanding, beginning of year (in dollars per share) $ 23.08 $ 23.08  
Forfeited (in dollars per share)   23.08  
Earned and issued (in dollars per share) 23.08    
Outstanding, end of year (in dollars per share) 23.08 $ 23.08 $ 23.08
Unvested and Expected to vest (in dollars per share) $ 23.08    
Information related to stock option and restricted stock awards granted      
Vesting period 4 years    
Expenses $ (57,000) $ 106,000 $ 491,000
Performance Stock Units | Tranche One      
Information related to stock option and restricted stock awards granted      
Return on average assets (as a percent) 1.25%    
Vesting rights (as a percent) 50.00%    
Performance Stock Units | Tranche Two      
Information related to stock option and restricted stock awards granted      
Return on average assets (as a percent) 1.25%    
Vesting rights (as a percent) 50.00%