Employee benefit plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Discretionary contribution percentage	50.00%
Maximum percentage of amount to be contributed by the employer	6.00%
Matching and profit sharing vesting period	3 years
Contribution provided by the bank to the plan	$ 3,923	$ 3,198	$ 2,325
Post retirement benefits payable	2,487	1,112
Expense related to plans	94	29	1
Payments to participants	172	131	150
Cash surrender value of bank owned life insurance	73,519	71,977
Cash value income	$ 1,542	$ 1,556	$ 242