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MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Constant prepayment rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 9.84% |  | 8.75% |
Constant prepayment rate | Minimum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input |  | 20.00% |  | 17.10%
Constant prepayment rate | Maximum |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input |  | 30.00% |  | 30.00%
Discount rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 7.77% | 7.71% | 8.25% | 7.78%

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