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SECURITIES LENDING - Schedule of contract value of securities leading transaction by type of collateral (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Securities borrowed | $ 2,050,079 | $ 2,870,939
Corporate securities - fixed income |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 188,168 | 283,809
Equity securities |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 1,847,793 | 2,575,919
Non-US sovereign debt |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 14,118 | 11,211
Overnight and continuous |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 2,050,079 | 2,870,939
Overnight and continuous | Corporate securities - fixed income |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 188,168 | 283,809
Overnight and continuous | Equity securities |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 1,847,793 | 2,575,919
Overnight and continuous | Non-US sovereign debt |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | $ 14,118 | $ 11,211

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