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MORTGAGE BANKING OPERATIONS - Key Economic Assumptions (Details) | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Constant prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Servicing asset, measurement input | 9.38% | 8.37%
Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques |  |
Servicing asset, measurement input | 8.34% | 8.37%

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