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FAIR VALUE MEASUREMENTS - Summary of Fair Value Option for Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Mortgage loans held for sale, at fair value | $ 1,126,159 | $ 901,227 | $ 858,314 | $ 845,775
Reverse mortgage loans held for investment, at fair value | 348,076 | 315,912 |  |
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings | 326,804 | 302,183 |  |
Mortgage Loans Held For Sale |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Mortgages held for sale unpaid principal balance | 1,125,664 | 892,816 |  |
Gain loss on mortgage loans held for sale at fair value | 495 | 8,411 |  |
Fair value, option, loans held as assets, 90 days or more past due | 7,800 | 7,300 |  |
Mortgages held for sale unpaid principal balance due | 10,700 | 9,900 |  |
Reverse Mortgage Loans Held For Investment |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gain loss on mortgage loans held for sale at fair value | 35,595 | 25,005 |  |
Reverse mortgage loans held for investment, principal amount due upon maturity | 312,481 | 290,907 |  |
Fair value, option, loans held as assets, 90 days or more past due | 6,400 | 3,400 |  |
Mortgages held for sale unpaid principal balance due | 5,900 | 3,300 |  |
Notes Receivable |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gain loss on mortgage loans held for sale at fair value | (699) | (929) |  |
Notes receivable, principal amount due upon maturity | 11,705 | 11,556 |  |
Debt |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gain loss on mortgage loans held for sale at fair value | 11,249 | 8,641 |  |
HMBS related borrowings, principal amount due upon maturity | $ 315,555 | $ 293,542 |  |

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- Definition This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing. + References No definition available. + Details
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- Definition Reverse Mortgage Loans Held For Investment, Principal Amount Due Upon Maturity + References No definition available. + Details
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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + Details
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- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + 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 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 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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