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 - MSR	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Discount rate | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.051	0.074
Discount rate | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.118	0.124
Discount rate | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.078	0.084
Prepayment rate | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.045	0.047
Prepayment rate | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.238	0.172
Prepayment rate | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.058	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	0.032	0.041
Delinquency rate | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	0.010	0.013
Cost to service | Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	78	83
Cost to service | Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	95	99
Cost to service | Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
MSR measurement inputs	86	87