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MORTGAGE SERVICING RIGHTS - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
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 $ 6.5 $ 8.0
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 6.80% 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 55.80% 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 24.00% 22.80%