MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) - Single family	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Constant prepayment rate
Fair Value Measurement Inputs and Valuation Techniques
Servicing asset, measurement input	11.42%	8.33%	10.14%	8.35%
Discount rate
Fair Value Measurement Inputs and Valuation Techniques
Servicing asset, measurement input	9.83%	8.48%	8.90%	8.43%

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