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Summary of significant accounting policies - Off-balance sheet financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Off-balance sheet financial instruments        
Off-balance sheet liability $ 880 $ 43 $ 179 $ 137
Other Liabilities.        
Off-balance sheet financial instruments        
Off-balance sheet liability $ 880 $ 43