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INVESTMENT SECURITIES - Equity-Method Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]    
Equity-method investments $ 17,354 $ 17,358
Mutual fund and hedge funds    
Schedule of Equity Method Investments [Line Items]    
Equity-method investments $ 17,354 $ 17,358