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Business Combinations - Schedule of Proforma Financial Information (Details) - NewPoint Holdings JV LLC - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Business Combination, Pro Forma Information [Line Items]    
Revenue $ 94,517 $ 258,759
Net income (loss) attributable to Franklin BSP Realty Trust, Inc. $ 23,172 $ 75,626