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MORTGAGE BANKING ACTIVITIES - OTHER INFORMATION RELATING TO MSRS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
MORTGAGE BANKING ACTIVITIES    
Fair value of mortgage servicing rights portfolio $ 9,068 $ 9,357
Monthly weighted average prepayment rate of unpaid principle balance (as percent) 202.00% 160.00%
Discount rate (as percent) 10.00% 10.00%
Weighted average foreclosure rate 0.14% 0.14%
Weighted average life in years 5 years 9 months 4 days 6 years 3 months 26 days