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Summary of significant accounting policies - Adoption of new accounting standard (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Summary of significant accounting policies    
Financing receivable, accrued interest, after allowance for credit loss $ 13,200 $ 10,700
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable Interest Receivable
Accrued interest receivable on available of sale securities $ 2,200 $ 1,700
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable Interest Receivable
Accrued interest receivable on held to maturity securities $ 179 $ 193
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable Interest Receivable