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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amounts recognized in the accumulated other comprehensive income (loss) consist of:      
Net amount recognized $ 4,315 $ 4,636  
Pension Benefits      
Defined Benefit Plan Disclosure      
(Other Assets) (2,314) (1,190)  
Amounts recognized in the accumulated other comprehensive income (loss) consist of:      
Net actuarial gain (5,499) (5,868)  
Deferred taxes 1,184 1,232  
Net amount recognized (4,315) (4,636)  
Accumulated benefit obligation $ 13,792 $ 18,066 $ 19,113