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MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Constant prepayment rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 8.33% | 12.64% | 8.35% | 13.76%
Discount rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques |  |  |  |
Servicing asset, measurement input | 8.48% | 7.88% | 8.43% | 7.86%

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