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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Derivatives, Fair Value |  |
Amount of reclassification as a reduction to interest income | $ 0 |
Amortized Amount of the Hedged Assets/(Liabilities) | 14,702 | $ 15,896
Fair value hedges | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | 136,306 | 139,219
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | 147 | 303
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swaps |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 136,306 | $ 139,219
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Debt Securities, Available-for-Sale, Excluding Accrued Interest | Debt Securities, Available-for-Sale, Excluding Accrued Interest
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | $ 147 | $ 303
Amortized Cost Basis Amount of the Hedged Assets | 136,300 | 139,200
Hedged Asset, carrying value | $ 25,000 | $ 75,000

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