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SECURITIES LENDING - Schedule of contract value of securities leading transaction by type of collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Securities borrowed | $ 2,782,000 | $ 2,343,327
Corporate securities - fixed income |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 315,070 | 401,898
Equity securities |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 2,448,926 | 1,925,549
Non-US sovereign debt |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 18,004 | 15,880
Overnight and continuous |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 2,782,000 | 2,343,327
Overnight and continuous | Corporate securities - fixed income |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 315,070 | 401,898
Overnight and continuous | Equity securities |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | 2,448,926 | 1,925,549
Overnight and continuous | Non-US sovereign debt |  |
Securities Financing Transaction [Line Items] |  |
Securities borrowed | $ 18,004 | $ 15,880

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