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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 16,063 | $ 21,005
Fair value hedges | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | 189,461 | 205,926
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | 378 | 434
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swaps |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 139,436 | $ 155,731
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) | $ 353 | $ 239
Amounts of designated hedged items | $ 75,000 | $ 100,000
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Debt Securities, Available-for-Sale, Excluding Accrued Interest | Debt Securities, Available-for-Sale, Excluding Accrued Interest
Fair value hedges | Derivatives designated as hedging instruments | Fixed rate loans |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 50,025 | $ 50,195
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | 25 | 195
Hedged Asset, carrying value | $ 50,000 | $ 50,000

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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