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Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) by component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Foreign Currency Translation          
Beginning Balance $ (78,011) $ (68,548) $ (71,365) $ (64,528)  
Other comprehensive income (loss) 7,499 165 854 (3,855)  
Net change 7,499 165 854 (3,855)  
Ending Balance (70,511) (68,383) (70,511) (68,383)  
Adjustment of pension and postretirement benefit plans          
Beginning Balance (93,271) (115,632) (94,692) (117,894)  
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 1,420 2,261 2,841 4,522  
Net change 1,420 2,261 2,841 4,522  
Ending Balance (91,851) (113,372) (91,851) (113,372)  
Unrealized net holding losses on debt securities          
Beginning Balance (1,318,705) (1,749,006) (1,495,183) (1,713,109)  
Other comprehensive income (loss) 48,417 16,941 188,646 (54,163)  
Amounts reclassified from accumulated other comprehensive loss for amortization of net unrealized losses of debt securities transferred from available-for-sale to held-to-maturity 36,994 35,537 73,242 70,745  
Net change 85,411 52,478 261,888 16,582  
Ending Balance (1,233,295) (1,696,527) (1,233,295) (1,696,527)  
Total (1,395,657) (1,878,282) (1,395,657) (1,878,282) $ (1,661,240)
Rounding          
Foreign Currency Translation          
Ending Balance (70,512)   (70,512)    
Adjustment of pension and postretirement benefit plans          
Ending Balance   (113,371)   (113,371)  
Unrealized net holding losses on debt securities          
Ending Balance $ (1,233,294) $ (1,696,528) $ (1,233,294) $ (1,696,528)