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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 ($)	Dec. 31, 2022 USD ($)
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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

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- Definition

Value of input used to measure servicing asset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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