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Related party transactions - Schedule of Investments in Debt and Equity of Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Aug. 01, 2025	Jul. 31, 2025
Related Party Transaction [Line Items]
Equity in earnings/(loss) from affiliates	$ 269	$ 231	$ 2,269	$ 1,416
Arc Home
Related Party Transaction [Line Items]
Loan securitization, ownership interest	66.00%		66.00%
AG Arc
Related Party Transaction [Line Items]
Equity in earnings/(loss) from affiliates	$ 715	(37)	$ 3,027	1,339
Non-QM Loans
Related Party Transaction [Line Items]
Equity in earnings/(loss) from affiliates	(444)	268	(718)	197
Re- and Non-Performing Loans
Related Party Transaction [Line Items]
Equity in earnings/(loss) from affiliates	$ (2)	$ 0	$ (40)	$ (120)
Related Party \| Arc Home
Related Party Transaction [Line Items]
Loan securitization, ownership interest	66.00%	44.60%	66.00%	44.60%	66.00%	66.00%	44.60%
Related Party \| AG Arc
Related Party Transaction [Line Items]
Distributions	$ 10,000
Related Party \| AG Arc \| TPG Mortgage Investment Trust, Inc.
Related Party Transaction [Line Items]
Distributions	6,600
Related Party \| Balance Sheet Location [Axis]: us-gaap:Assets
Related Party Transaction [Line Items]
Investments, assets	55,022		$ 55,022		$ 61,345
Cash and Other assets/(liabilities)	242		242		1,291
Related Party \| Balance Sheet Location [Axis]: us-gaap:Assets \| AG Arc
Related Party Transaction [Line Items]
Investments, assets	46,435		46,435		50,016
Related Party \| Balance Sheet Location [Axis]: us-gaap:Assets \| Real Estate Securities
Related Party Transaction [Line Items]
Investments, market value	8,345		8,345		10,038
Related Party \| Balance Sheet Location [Axis]: us-gaap:Assets \| Non-QM Loans
Related Party Transaction [Line Items]
Investments, market value	7,828		7,828		9,439
Related Party \| Balance Sheet Location [Axis]: us-gaap:Assets \| Re- and Non-Performing Loans
Related Party Transaction [Line Items]
Investments, market value	517		517		599
Related Party \| Balance Sheet Location [Axis]: us-gaap:Liabilities
Related Party Transaction [Line Items]
Investments, liabilities	(17)		(17)		(12)
Cash and Other assets/(liabilities)	(17)		(17)		(12)
Related Party \| Balance Sheet Location [Axis]: us-gaap:Liabilities \| AG Arc
Related Party Transaction [Line Items]
Investments, liabilities	0		0		0
Related Party \| Balance Sheet Location [Axis]: us-gaap:Liabilities \| Real Estate Securities
Related Party Transaction [Line Items]
Investments, market value	0		0		0
Related Party \| Balance Sheet Location [Axis]: us-gaap:Liabilities \| Non-QM Loans
Related Party Transaction [Line Items]
Investments, market value	0		0		0
Related Party \| Balance Sheet Location [Axis]: us-gaap:Liabilities \| Re- and Non-Performing Loans
Related Party Transaction [Line Items]
Investments, market value	0		0		0
Related Party \| Balance Sheet Location [Axis]: us-gaap:StockholdersEquity
Related Party Transaction [Line Items]
Investments, equity	55,005		55,005		61,333
Cash and Other assets/(liabilities)	225		225		1,279
Related Party \| Balance Sheet Location [Axis]: us-gaap:StockholdersEquity \| AG Arc
Related Party Transaction [Line Items]
Investments, equity	46,435		46,435		50,016
Related Party \| Balance Sheet Location [Axis]: us-gaap:StockholdersEquity \| Real Estate Securities
Related Party Transaction [Line Items]
Investments, market value	8,345		8,345		10,038
Related Party \| Balance Sheet Location [Axis]: us-gaap:StockholdersEquity \| Non-QM Loans
Related Party Transaction [Line Items]
Investments, market value	7,828		7,828		9,439
Related Party \| Balance Sheet Location [Axis]: us-gaap:StockholdersEquity \| Re- and Non-Performing Loans
Related Party Transaction [Line Items]
Investments, market value	$ 517		$ 517		$ 599