Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans individually evaluated for credit loss	$ 1,680
Impaired loans		$ 220
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Loans individually evaluated for credit loss	$ 1,680
Impaired loans		$ 220