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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Foreign Currency Translation        
Beginning Balance $ (56,735) $ (67,307) $ (71,254)  
Other comprehensive (loss) income (7,793) 10,572 3,947  
Net change (7,793) 10,572 3,947  
Ending Balance (64,528) (56,735) (67,307)  
Adjustment of pension and postretirement benefit plans        
Beginning Balance (144,335) (158,994) (195,056)  
Other comprehensive income (loss) before reclassification 14,408 4,882 23,094  
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 12,034 9,777 12,968  
Net change 26,442 14,659 36,062  
Ending Balance (117,893) (144,335) (158,994)  
Unrealized net holding (losses) gains on debt securities        
Beginning Balance (2,323,903) (96,120) 460,900  
Other comprehensive income (loss) before reclassifications 472,487 (2,261,097) (557,002)  
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities 0 0 (18)  
Amounts reclassified from accumulated other comprehensive (loss) income for amortization of net unrealized losses of debt securities transferred from available-for-sale to held-to-maturity 138,306 33,314 0  
Net change 610,793 (2,227,783) (557,020)  
Ending Balance (1,713,110) (2,323,903) (96,120)  
Unrealized net gains (losses) on cash flow hedges        
Beginning Balance 45 (2,648) (4,599)  
Other comprehensive income before reclassifications (19) 3,107 367  
Amounts reclassified from accumulated other comprehensive income (loss) (26) (414) 1,584  
Net change (45) 2,693 1,951  
Ending Balance 0 45 (2,648)  
Accumulated other comprehensive loss, net of tax $ (1,895,531) $ (2,524,928) $ (325,069) $ (325,069)