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Fair value measurement - Loans held for sale at fair value (Details) - Level 2 - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale $ 5,509 $ 3,239
Aggregated unpaid principal balance 5,507 3,202
Difference $ 2 $ 37