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MORTGAGE OPERATIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
MORTGAGE OPERATIONS [Abstract]          
Real estate mortgage loans serviced $ 216,266   $ 216,266   $ 221,591
Key assumptions used in measuring the fair value of mortgage servicing rights [Abstract]          
Constant prepayment rate     9.39%   10.80%
Discount rate     10.02%   10.02%
Weighted average life     6 years 6 months 11 days   6 years 7 days
Mortgage servicing rights [Roll Forward]          
Beginning balance     $ 1,712    
Additions     72    
Reductions     (143)    
Ending balance 1,641   1,641   $ 1,712
Valuation allowance [Roll Forward]          
Beginning balance     0    
Additions     0    
Reductions     0    
Ending balance 0   0   0
Mortgage servicing rights, net of valuation allowance [Roll Forward]          
Beginning balance     1,712    
Additions     72    
Reductions     (143)    
Ending balance 1,641   1,641    
Fair value of mortgage servicing rights asset 2,011   2,011   $ 1,876
Contractually specified servicing fee $ 138 $ 145 $ 277 $ 291