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Fair value measurement - Gains and losses (realized and unrealized) included in earnings for level 3 assets and liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings $ (4,900) $ (2,796) $ (10,793) $ (10,407)
Changes in unrealized gains (losses) included in earnings relating to assets still held (2,571) (377) (3,261) (1,807)
Mortgage banking activities        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (4,896) (2,793) (10,280) (10,386)
Changes in unrealized gains (losses) included in earnings relating to assets still held (2,577) (381) (3,279) (1,828)
Trading account profit (loss)        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings (4) (3) (13) (21)
Changes in unrealized gains (losses) included in earnings relating to assets still held 6 $ 4 18 $ 21
Provision for credit losses        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Gains (Losses) included in earnings 0   (500)  
Changes in unrealized gains (losses) included in earnings relating to assets still held $ 0   $ 0