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Other comprehensive income (loss) - Reclassification out of accumulated other comprehensive loss (Details) - Reclassifications Out of Accumulated Other Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassifications Out of Accumulated Other Comprehensive Loss        
Net of tax $ (38,525) $ (38,036) $ (113,792) $ (111,981)
Adjustment of pension and postretirement benefit plans        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax (3,618) (4,814) (10,854) (14,440)
Income tax benefit (expense) 1,357 1,805 4,070 5,415
Net of tax (2,261) (3,009) (6,784) (9,025)
Adjustment of pension and postretirement benefit plans | Other operating expenses        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax (3,618) (4,814) (10,854) (14,440)
Unrealized holding losses on debt securities        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax (45,331) (43,783) (133,761) (128,726)
Income tax benefit (expense) 9,067 8,756 26,753 25,744
Net of tax (36,264) (35,027) (107,008) (102,982)
Unrealized holding losses on debt securities | Investment securities        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax (45,331) (43,783) (133,761) (128,726)
Unrealized net (losses) gains on cash flow hedges        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax 0 0 0 41
Income tax benefit (expense) 0 0 0 (15)
Net of tax 0 0 0 26
Unrealized net (losses) gains on cash flow hedges | Forward contracts | Mortgage banking activities        
Reclassifications Out of Accumulated Other Comprehensive Loss        
Before Tax $ 0 $ 0 $ 0 $ 41