Stock-based compensation - Stock option activity (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the beginning of period -Options | shares	13,475
Granted - Options | shares	10,229
Exercised - Options | shares	(4,960)
Forfeited/expired - Options | shares	(9,074)
Outstanding at the ending of period -Options | shares	9,670
Outstanding-Weighted Average Exercise Price at the beginning of period - Options | $ / shares	$ 16.97
Granted-Weighted Average Exercise Price | $ / shares	20.72
Exercised-Weighted Average Exercise Price | $ / shares	14.94
Forfeited/expired-Weighted Average Exercise Price | $ / shares	16.87
Outstanding-Weighted Average Exercise Price at the ending of period - Options | $ / shares	$ 22.08
Outstanding-Weighted Average Remaining Contractual Life (Years)	1 year 8 months 8 days
Outstanding-Aggregate Intrinsic Value | $	$ 127,743