v3.26.1
Other comprehensive income (loss) - Change in accumulated other comprehensive income (loss) by component (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Foreign Currency Translation      
Beginning Balance $ (85,282) $ (71,365)  
Other comprehensive (loss) income (256) (6,646)  
Net change (256) (6,646)  
Ending Balance (85,538) (78,011)  
Adjustment of pension and postretirement benefit plans      
Beginning Balance (91,155) (94,692)  
Amounts reclassified from accumulated other comprehensive loss for amortization of net losses 1,411 1,421  
Net change 1,411 1,421  
Ending Balance (89,744) (93,271)  
Unrealized net holding losses on debt securities      
Beginning Balance (1,005,650) (1,495,183)  
Other comprehensive income (25,257) 140,229  
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 37,501 36,249  
Net change 12,244 176,478  
Ending Balance (993,406) (1,318,705)  
Total $ (1,168,688) $ (1,489,987) $ (1,182,087)