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MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) - Single family | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Constant prepayment rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 13.06% | 9.84% | 10.72% | 8.75%
Discount rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 10.36% | 7.77% | 9.19% | 8.25%

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