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, 2024 USD ($)	Dec. 31, 2023 USD ($)
Discount rate | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.018	0.070
Discount rate | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.112	0.120
Discount rate | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.076	0.086
Prepayment rate | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.051	0.048
Prepayment rate | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.313	0.110
Prepayment rate | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.061	0.056
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	0.040	0.042
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	83	84
Cost to service | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	108	111
Cost to service | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	91	94