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MORTGAGE SERVICING RIGHTS - Summary of the Weighted Average Discount Rate, Prepayment Speed and Cost to Service Assumptions Used to Determine the Fair Value of MSRs (Details) - $ / loan | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Minimum |  |
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] |  |
Discount rate | 9.60% | 9.60%
Prepayment rate | 6.10% | 6.40%
Cost to service (in USD per loan) | 71.9 | 72.1
Maximum |  |
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] |  |
Discount rate | 15.50% | 15.50%
Prepayment rate | 36.00% | 32.00%
Cost to service (in USD per loan) | 657.7 | 366.3
Weighted Average |  |
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] |  |
Discount rate | 10.90% | 10.90%
Prepayment rate | 8.00% | 8.50%
Cost to service (in USD per loan) | 96.2 | 96.4

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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 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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- Definition Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481326/860-20-50-4 + Details
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