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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) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Government Guaranteed Mortgage Loans [Member] | Maximum [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 | 6.20% | 7.60% | 9.20%
Discount rate | 12.00% | 12.00% | 11.50%
Government Guaranteed Mortgage Loans [Member] | Minimum [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% | 5.90% | 7.80%
Discount rate | 12.00% | 11.50% | 11.50%
Conventional Loan [Member] | Maximum [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 | 6.70% | 8.00% | 9.00%
Discount rate | 10.00% | 10.00% | 9.50%
Conventional Loan [Member] | Minimum [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 | 6.30% | 6.30% | 7.90%
Discount rate | 10.00% | 9.50% | 9.50%
Conventional Non Conforming Mortgage Loans [Member] | Maximum [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 | 9.50% | 14.10% | 14.40%
Discount rate | 14.30% | 14.30% | 13.80%
Conventional Non Conforming Mortgage Loans [Member] | Minimum [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 | 9.10% | 9.30% | 12.90%
Discount rate | 14.30% | 13.80% | 13.80%

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107207-111719 + Details
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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 No definition available. + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107207-111719 + Details
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