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MORTGAGE BANKING ACTIVITIES - OTHER INFORMATION RELATING TO MSRS (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
MORTGAGE BANKING ACTIVITIES    
Fair value of mortgage servicing rights portfolio $ 10,906 $ 8,318
Monthly weighted average prepayment rate of unpaid principle balance (as percent) 205.00% 308.00%
Discount rate (as percent) 10.00% 10.00%
Weighted average foreclosure rate 0.24% 0.44%
Weighted average life in years 5 years 10 months 17 days 4 years 10 months 6 days