Revenue from service contracts (Details) - Asset Management - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Servicing fees	$ (707)	$ (298)
Management fees
Disaggregation of Revenue [Line Items]
Fee revenue	1,639	3,240
Incentive fees
Disaggregation of Revenue [Line Items]
Fee revenue	394	299
Advisory and transaction fees
Disaggregation of Revenue [Line Items]
Fee revenue	$ 66	$ 0