EXCESS MORTGAGE SERVICING RIGHTS - Narrative (Details) - MSRs	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Weighted Average
Servicing Assets at Fair Value [Line Items]
Discount rate	7.40%	8.10%
Minimum
Servicing Assets at Fair Value [Line Items]
Discount rate	6.90%	7.30%
Maximum
Servicing Assets at Fair Value [Line Items]
Discount rate	12.50%	13.00%
Excess MSRs Investees | Weighted Average
Servicing Assets at Fair Value [Line Items]
Discount rate	7.80%	7.80%
Excess MSRs Investees | Minimum
Servicing Assets at Fair Value [Line Items]
Discount rate	7.50%	7.50%
Excess MSRs Investees | Maximum
Servicing Assets at Fair Value [Line Items]
Discount rate	8.00%	8.00%