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INVESTMENTS - Schedule of Unrealized Gains (Losses) Recognized on Investment in Private Equity Limited Partnership Still Held (Details) - Private Equity Funds - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Investment Income [Line Items] |  |  |  |
Total unrealized gains (losses) recognized during the reported period on investments in private equity limited partnerships still held at the end of the reported period | $ (29) | $ 1,814 | $ (18) | $ 1,814
Fair Value, Inputs, Level 1, Level 2, and Level 3 |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total unrealized gains (losses) recognized during the reported period on investments in private equity limited partnerships still held at the end of the reported period | 0 | 1,814 | 0 | 1,814
Fair Value Measured at Net Asset Value Per Share |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total unrealized gains (losses) recognized during the reported period on investments in private equity limited partnerships still held at the end of the reported period | $ (29) | $ 0 | $ (18) | $ 0

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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 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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