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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Key Economic Assumptions Used in Determining Fair Value at Time of Sale of Loans (Detail) | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Maximum [Member] | Conventional Loan [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 18.40% | 17.40%
Discount rate | 10.00% | 10.00%
Maximum [Member] | Conventional Non Conforming Mortgage Loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 21.90% | 0.00%
Discount rate | 14.50% | 0.00%
Maximum [Member] | Government-guaranteed mortgage loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 18.30% | 17.40%
Discount rate | 12.00% | 12.00%
Minimum [Member] | Conventional Loan [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 3.40% | 2.80%
Discount rate | 9.50% | 10.00%
Minimum [Member] | Conventional Non Conforming Mortgage Loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 3.80% | 0.00%
Discount rate | 11.50% | 0.00%
Minimum [Member] | Government-guaranteed mortgage loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 4.80% | 3.70%
Discount rate | 11.50% | 12.00%
Weighted Average [Member] | Conventional Loan [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 6.60% | 6.20%
Discount rate | 9.80% | 10.00%
Weighted Average [Member] | Conventional Non Conforming Mortgage Loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 6.00% | 0.00%
Discount rate | 12.40% | 0.00%
Weighted Average [Member] | Government-guaranteed mortgage loans [Member] |  |
Assumption For Fair Value On Securitization Date Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities [Line Items] |  |
Constant prepayment rate | 6.60% | 6.10%
Discount rate | 11.80% | 12.00%

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- Definition Discount rate which is used to value residual cash flows generated by financial assets of the securitization, asset-backed financing arrangement, or similar transfer for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107207-111719 + Details
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