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Related party transactions - Management fee (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Management fee expense		$ 9,266	$ 7,533
Affiliated Entity
Related Party Transaction [Line Items]
Management fee expense	[1]	$ 9,266	7,533
Affiliated Entity | Western Asset Mortgage Capital Corporation
Related Party Transaction [Line Items]
Management fee amount waived			$ 1,800
[1] Refer to Note 10 for additional details on related party transactions.

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