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MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) - Single family | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Constant prepayment rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 16.70% | 11.42% | 13.78% | 10.14%
Discount rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 10.99% | 9.83% | 10.44% | 8.90%

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