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MORTGAGE SERVICING RIGHTS - Servicing Asset at Amortized Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Beginning of period $ 3,252    
Increase in mortgage servicing rights resulting from transfers of financial assets (297) $ (182)  
End of period 3,999   $ 3,252
Mortgage servicing rights      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Beginning of period 5,266 4,541 4,541
Increase in mortgage servicing rights resulting from transfers of financial assets 297   2,020
Amortization during the period (439)   (1,295)
End of period 5,124   5,266
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]      
Valuation allowance, beginning of period (2,014) $ (259) (259)
Additions 0   (1,755)
Recoveries 889   0
Balance at beginning of period (1,125)   (2,014)
Mortgage servicing rights, net 3,999   3,252
Fair value of mortgage servicing rights; end of period 4,005   3,285
Residential mortgage loans serviced for others $ 551,622   $ 553,655
Net book value of MSR asset to loans serviced for others (as a percent) 0.73%   0.59%