Securities sold under repurchase agreements (Details) - Loans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements, ending balance	$ 11,430	$ 7,116
Repurchase agreements, average balance during period	10,679	7,986
Book value of collateral	17,084	12,632
Market value of collateral	$ 17,469	$ 13,196
Weighted average rate during period	0.15%	0.25%
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements	1 day	1 day