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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, 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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