Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2021

Employee benefit plans

Schedule of components of net periodic benefit cost

	Pension Benefits
Three Months Ended September 30,	2021		2020
Components of net periodic pension benefit:
Interest cost	$	105	$	164
Expected return on plan assets		(322)		(371)
Amortization of unrecognized net gain		76		65
Net periodic benefit	$	(141)	$	(142)
	Pension Benefits
Nine Months Ended September 30,	2021		2020
Components of net periodic pension benefit:
Interest cost	$	315	$	381
Expected return on plan assets		(966)		(865)
Amortization of unrecognized net gain		227		152
Net periodic benefit	$	(424)	$	(332)