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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Total gains (losses) included in earnings $ (1,959) $ (1,953) $ (5,535) $ (5,893)
Changes in unrealized gains (losses) relating to assets still held at reporting date 356 510 (961) (1,190)
Mortgage banking activities        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Total gains (losses) included in earnings (1,954) (1,945) (5,524) (5,384)
Changes in unrealized gains (losses) relating to assets still held at reporting date 348 500 (977) (702)
Trading account profit (loss)        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Total gains (losses) included in earnings (5) (8) (11) (9)
Changes in unrealized gains (losses) relating to assets still held at reporting date $ 8 10 $ 16 12
Provision for credit losses        
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Abstract        
Total gains (losses) included in earnings   0   (500)
Changes in unrealized gains (losses) relating to assets still held at reporting date   $ 0   $ (500)