Stock-based compensation - Stock option activity (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at the beginning of period -Options | shares	11,740
Granted - Options | shares	16,319
Exercised - Options | shares	(8,231)
Forfeited/expired - Options | shares	(7,653)
Outstanding at the ending of period -Options | shares	12,175
Outstanding-Weighted Average Exercise Price at the beginning of period - Options | $ / shares	$ 13.59
Granted-Weighted Average Exercise Price | $ / shares	13.62
Exercised-Weighted Average Exercise Price | $ / shares	12.12
Forfeited/expired-Weighted Average Exercise Price | $ / shares	11.28
Outstanding-Weighted Average Exercise Price at the ending of period - Options | $ / shares	$ 16.08
Outstanding-Weighted Average Remaining Contractual Life (Years)	2 years 3 months 14 days
Outstanding-Aggregate Intrinsic Value | $	$ 237,705