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SALE OF MIDDLE MARKET LENDING PORTFOLIO (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Apr. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Business divestiture-related gains (losses) $ 0 $ (2,936) $ 0 $ (27,245)    
Discontinued Operations, Disposed of by Sale | Middle Market Lending Portfolio            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sale of business           $ 2,400,000
Loans sold         $ 1,900,000  
Cash proceeds         1,900,000  
Business divestiture-related gains (losses)         $ 20,400