v3.26.1
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