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FAIR VALUE - Fair Value Inputs and Valuation Techniques (Details) | Sep. 30, 2021 $ / loan | Dec. 31, 2020 $ / loan
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Derivative | IRLCs | Minimum | Pull-through rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, measurement input | 0.030 | 0.028
Derivative | IRLCs | Maximum | Pull-through rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, measurement input | 0.999 | 0.999
Derivative | IRLCs | Weighted Average | Pull-through rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Derivative, measurement input | 0.761 | 0.705
Servicing rights | Minimum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.047 | 0.050
Servicing rights | Minimum | Prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.086 | 0.134
Servicing rights | Minimum | Cost to service (per loan) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 70 | 71
Servicing rights | Maximum | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.091 | 0.100
Servicing rights | Maximum | Prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.190 | 0.348
Servicing rights | Maximum | Cost to service (per loan) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 126 | 139
Servicing rights | Weighted Average | Discount rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.060 | 0.062
Servicing rights | Weighted Average | Prepayment rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 0.101 | 0.140
Servicing rights | Weighted Average | Cost to service (per loan) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Servicing right, measurement input | 84 | 89

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