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Employee benefit plans - Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) $ 5,499 $ 5,868  
Pension Benefits      
Components of net periodic pension cost:      
Interest cost 456 419 $ 544
Expected return on plan assets (1,407) (1,288) (1,236)
Amortization of unrecognized net loss 198 301 218
Net periodic pension income: (753) (568) (474)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) 456 419 544
Deferred tax (96) (88) (114)
Total recognized in other comprehensive income (loss) 360 331 430
Total recognized in net period pension cost and other comprehensive income (loss) $ (393) $ (237) $ (44)