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MORTGAGE OPERATIONS (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
MORTGAGE OPERATIONS [Abstract]          
Real estate mortgage loans serviced $ 208,637,000   $ 208,637,000   $ 206,208,000
Key assumptions used in measuring the fair value of mortgage servicing rights [Abstract]          
Constant prepayment rate     17.95%   20.22%
Discount rate     9.50%   10.00%
Weighted average life     4 years 6 months 10 days   3 years 11 months 15 days
Mortgage servicing rights [Roll Forward]          
Beginning balance     $ 1,628,000    
Additions     515,000    
Reductions     (353,000)    
Ending balance 1,790,000   1,790,000   $ 1,628,000
Valuation allowance [Roll Forward]          
Beginning balance     (386,000)    
Additions     (24,000)    
Reductions     0    
Ending balance (410,000)   (410,000)   (386,000)
Mortgage servicing rights, net of valuation allowance [Roll Forward]          
Beginning balance     1,242,000    
Additions     491,000    
Reductions     (353,000)    
Ending balance 1,380,000   1,380,000    
Fair value of mortgage servicing rights assets 1,380,000   1,380,000   $ 1,242,000
Contractually specified servicing fees $ 136,000 $ 134,000 $ 399,000 $ 396,000