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Other comprehensive income (loss) - Reclassification out of accumulated other comprehensive income (Details) - Reclassification out of accumulated other comprehensive loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Net of tax $ (150,314) $ (42,677) $ (14,534)
Pension and postretirement benefit plan      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax (19,253) (15,644) (20,749)
Income tax benefit (expense) 7,219 5,867 7,781
Net of tax (12,034) (9,777) (12,968)
Pension and postretirement benefit plan | Other operating income (expenses)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax (19,253) (15,644) (20,749)
Gains (losses) on debt securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax (172,883) (41,642) 23
Income tax benefit (expense) 34,577 8,328 (5)
Net of tax (138,306) (33,314) 18
Gains (losses) on debt securities | Investment securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax (172,883) (41,642) 0
Gains (losses) on debt securities | Net gain (loss) on sale of debt securities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax 0 0 23
Unrealized net gains (losses) on cash flow hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax 41 960 (1,847)
Income tax benefit (expense) (15) (546) 263
Net of tax 26 414 (1,584)
Unrealized net gains (losses) on cash flow hedges | Forward contracts | Mortgage banking activities      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax 41 1,458 (704)
Unrealized net gains (losses) on cash flow hedges | Interest rate swap | Other operating income (expenses)      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]      
Before Tax $ 0 $ (498) $ (1,143)