Variable interest entities ("VIEs") - Maximum Exposure (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 3,234	$ 0
Assets
Variable Interest Entity [Line Items]
Maximum loss exposure	3,234	0
Liabilities
Variable Interest Entity [Line Items]
Maximum loss exposure	0	0
Unfunded commitments
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 0	$ 0