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Summary of significant accounting policies - Adoption of new accounting standard (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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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

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