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Other comprehensive income (loss) - Reclassification out of accumulated other comprehensive income (Details) - Reclassification out of accumulated other comprehensive income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Reclassification out of accumulated other comprehensive loss    
Net of tax $ (2,111) $ (3,290)
Pension and postretirement benefit plan    
Reclassification out of accumulated other comprehensive loss    
Before Tax (3,911) (5,190)
Income tax benefit 1,467 1,948
Net of tax (2,444) (3,242)
Pension and postretirement benefit plan | Other operating expense    
Reclassification out of accumulated other comprehensive loss    
Before Tax (3,911) (5,190)
Cash flow hedge    
Reclassification out of accumulated other comprehensive loss    
Before Tax 699 91
Income tax benefit (366) (139)
Net of tax 333 (48)
Cash flow hedge | Forward contracts | Mortgage banking activities    
Reclassification out of accumulated other comprehensive loss    
Before Tax 978 370
Cash flow hedge | Interest rate swap | Other operating expense    
Reclassification out of accumulated other comprehensive loss    
Before Tax $ (279) $ (279)