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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification out of accumulated other comprehensive loss        
Net of tax $ (37,798) $ (37,330) $ (75,267) $ (73,945)
Adjustment of pension and postretirement benefit plans        
Reclassification out of accumulated other comprehensive loss        
Before Tax (3,618) (4,813) (7,236) (9,626)
Income tax benefit (expense) 1,357 1,805 2,714 3,610
Net of tax (2,261) (3,008) (4,522) (6,016)
Adjustment of pension and postretirement benefit plans | Other operating expenses        
Reclassification out of accumulated other comprehensive loss        
Before Tax (3,618) (4,813) (7,236) (9,626)
Unrealized holding losses on debt securities        
Reclassification out of accumulated other comprehensive loss        
Before Tax (44,421) (42,903) (88,430) (84,943)
Income tax benefit (expense) 8,884 8,581 17,685 16,988
Net of tax (35,537) (34,322) (70,745) (67,955)
Unrealized holding losses on debt securities | Investment securities        
Reclassification out of accumulated other comprehensive loss        
Before Tax (44,421) (42,903) (88,430) (84,943)
Unrealized net (losses) gains on cash flow hedges        
Reclassification 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        
Reclassification out of accumulated other comprehensive loss        
Before Tax 0 0 0 41
Unrealized net (losses) gains on cash flow hedges | Interest rate swap | Other operating expenses        
Reclassification out of accumulated other comprehensive loss        
Before Tax $ 0 $ 0 $ 0 $ 0