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Related party transactions - Transactions with Arc Home (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Residential mortgage loans sold by Arc Home to the Company | Residential Mortgage | ARC Home | Related Party
Related Party Transaction [Line Items]
Balance of loans with unpaid principal sold	$ 137,661	$ 432,543

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Principal Amount Outstanding Of Loans Held-In-Portfolio Sold During Period

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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