Other Assets - Schedule of Aggregate Carrying Value of REO Properties (Details) $ in Thousands	Sep. 30, 2025 USD ($) property	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($) property	Sep. 30, 2024 USD ($) property	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Real Estate Properties [Line Items]
Total	$ 138,121	$ 135,824	$ 130,854	$ 127,097	$ 108,013	$ 110,174
Wholly Owned Properties
Real Estate Properties [Line Items]
Total	$ 138,121		$ 130,854
Number of properties \| property	373		416	411
Wholly Owned Properties \| Non-QM loans
Real Estate Properties [Line Items]
Total	$ 8,280		$ 1,278
Wholly Owned Properties \| Business purpose loans
Real Estate Properties [Line Items]
Total	84,585		71,090
Wholly Owned Properties \| Legacy RPL/NPL loans
Real Estate Properties [Line Items]
Total	$ 45,256		$ 58,486

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

MFA FINANCIAL, INC. 10-Q