Variable interest entities ("VIEs") - Schedule of Unfunded Commitments VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 3,323	$ 3,234
Assets
Variable Interest Entity [Line Items]
Maximum loss exposure	3,323	3,234
Liabilities
Variable Interest Entity [Line Items]
Maximum loss exposure	0	0
Unfunded commitments
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 0	$ 0