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Derivatives and hedging activities - Cumulative Basis Adjustment for Fair Value Hedges (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 21,804 | $ 19,833
Hedged Asset, Statement of Financial Position [Extensible Enumeration] | Available-for-sale Securities, Debt Securities |
Fair value hedges | Derivatives designated as hedging instruments |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 193,313 | 194,035
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | (233) | 1,333
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swaps |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | $ 143,338 | $ 143,573
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Available-for-sale Securities, Debt Securities | Available-for-sale Securities, Debt Securities
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | $ (208) | $ 871
Amortized Cost Basis Amount of the Hedged Assets | 143,300 |
Amounts of designated hedged items | 100,000 |
Fair value hedges | Derivatives designated as hedging instruments | Fixed Rate Loans |  |
Derivatives, Fair Value |  |
Amortized Amount of the Hedged Assets/(Liabilities) | 49,975 | 50,462
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities) | (25) | $ 462
Hedged Asset, carrying value | $ 50,000 |

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