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FAIR VALUE MEASUREMENTS - Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Level 3 MSRs (Detail) - Fair Value, Measurements, Recurring - Level 3 | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Discount rate | Minimum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.080 | 0.084
Discount rate | Maximum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.106 | 0.107
Discount rate | Weighted Average |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.094 | 0.097
Prepayment rate | Minimum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.044 | 0.048
Prepayment rate | Maximum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.082 | 0.081
Prepayment rate | Weighted Average |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.049 | 0.054
Delinquency rate | Minimum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.002 | 0.002
Delinquency rate | Maximum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.039 | 0.045
Delinquency rate | Weighted Average |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 0.012 | 0.013
Cost to service | Minimum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 84 | 86
Cost to service | Maximum |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 109 | 118
Cost to service | Weighted Average |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
MSR measurement inputs | 94 | 95

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