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Real Estate Securities - Gross Realized Gains and Losses on Sales and Calls of Available for Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]        
Total Realized Gains on Sales and Calls of AFS Securities, net $ 26 $ 0 $ 1,502 $ 1,914
Sales        
Debt Securities, Available-for-sale [Line Items]        
Gross realized gains 103 0 3,917 0
Gross realized loss (77) 0 (2,415) 0
Calls        
Debt Securities, Available-for-sale [Line Items]        
Gross realized gains 0 0 0 1,914
Gross realized loss $ 0 $ 0 $ 0 $ 0