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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash and Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted Cash      
Restricted Cash $ 1,861 $ 22,734 $ 29,536
Restricted cash, escrow account in connection with Mitigation Bank | Mitigation Bank      
Restricted Cash      
Restricted Cash 600    
Restricted cash escrow account in connection with reserves for commercial loans and investments      
Restricted Cash      
Restricted Cash $ 1,300