Equity investment securities - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Equity securities sold (in shares)	769,887
Net proceeds from sale of equity securities	$ 1,100
Realized net loss from sale of equity securities	$ 500
Equity securities, shares remaining (in shares)	256,631
Unrealized gain (loss) on equity securities	$ 1,815	$ (1,588)