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MORTGAGE SERVICING RIGHTS - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]      
Custodial account balances maintained in connection with serviced loans   $ 8.0 $ 7.2
Discount rate used to calculate fair value of MSRs 10.00% 10.00%  
Default rate used to calculate fair value of MSRs 5.00% 5.00%  
Minimum      
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]      
Prepayment speed rate used to calculate fair value of MSRs 9.30% 6.00%  
Maximum      
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]      
Prepayment speed rate used to calculate fair value of MSRs 64.60% 58.70%  
Weighted Average      
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]      
Prepayment speed rate used to calculate fair value of MSRs 33.10% 22.80%