Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Segment Reporting (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Interest income	$ 106,167	$ 134,142	$ 331,246	$ 398,253
Mortgage servicing rights	19,745	0	19,745	0
Contractual servicing fee	3,606	0	3,606	0
Revenue from real estate owned	7,222	5,412	22,355	14,196
Interest expense	(76,492)	(89,884)	(217,298)	(257,942)
Compensation and benefits	(34,434)	0	(34,434)	0
Administrative services expenses	(3,455)	(3,801)	(10,687)	(7,365)
Depreciation and amortization	(3,432)	(1,387)	(6,193)	(4,221)
Operating expenses	(29,733)	(14,458)	(75,078)	(42,521)
Other segment items	28,422	149	32,443	(38,165)
Net income/(loss)	17,616	30,173	65,705	62,235
Total Assets	6,218,475		6,218,475		$ 6,002,386
Real Estate Debt and Other Real Estate Investments
Segment Reporting Information [Line Items]
Interest income	97,546	131,982	318,120	392,712
Mortgage servicing rights	0		0
Contractual servicing fee	0		0
Revenue from real estate owned	0	0	0	0
Interest expense	(69,186)	(89,188)	(208,753)	(255,865)
Compensation and benefits	0		0
Administrative services expenses	(2,330)	(2,374)	(7,384)	(3,508)
Depreciation and amortization	0	0	0	0
Operating expenses	(14,898)	(8,377)	(39,141)	(30,020)
Other segment items	(1,972)	(1,402)	(2,211)	(39,866)
Net income/(loss)	9,160	30,641	60,631	63,453
Total Assets	4,661,389		4,661,389		5,466,780
Agency
Segment Reporting Information [Line Items]
Interest income	6,286	0	6,286	0
Mortgage servicing rights	19,745		19,745
Contractual servicing fee	3,606		3,606
Revenue from real estate owned	0	0	0	0
Interest expense	(6,712)	0	(6,712)	0
Compensation and benefits	(34,434)		(34,434)
Administrative services expenses	(247)	0	(247)	0
Depreciation and amortization	(2,076)	0	(2,076)	0
Operating expenses	(6,899)	0	(6,899)	0
Other segment items	29,907	0	29,907	0
Net income/(loss)	9,176	0	9,176	0
Total Assets	1,112,743		1,112,743		0
TRS
Segment Reporting Information [Line Items]
Interest income	1,450	1,761	3,901	4,862
Mortgage servicing rights	0		0
Contractual servicing fee	0		0
Revenue from real estate owned	0	0	0	0
Interest expense	(140)	(182)	(482)	(539)
Compensation and benefits	0		0
Administrative services expenses	(878)	(1,427)	(3,056)	(3,857)
Depreciation and amortization	0	0	0	0
Operating expenses	(1,016)	(1,711)	(3,217)	(4,640)
Other segment items	2,890	4,083	7,265	10,771
Net income/(loss)	2,306	2,524	4,411	6,597
Total Assets	54,488		54,488		128,430
Real Estate Owned
Segment Reporting Information [Line Items]
Interest income	885	399	2,939	679
Mortgage servicing rights	0		0
Contractual servicing fee	0		0
Revenue from real estate owned	7,222	5,412	22,355	14,196
Interest expense	(454)	(514)	(1,351)	(1,538)
Compensation and benefits	0		0
Administrative services expenses	0	0	0	0
Depreciation and amortization	(1,356)	(1,387)	(4,117)	(4,221)
Operating expenses	(6,920)	(4,370)	(25,821)	(7,861)
Other segment items	(2,403)	(2,532)	(2,518)	(9,070)
Net income/(loss)	(3,026)	$ (2,992)	(8,513)	$ (7,815)
Total Assets	$ 389,855		$ 389,855		$ 407,176

Franklin BSP Realty Trust, Inc. 10-Q