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Derivative financial instruments - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative, cash collateral advanced to counterparties $ 3,700 $ 4,600
Cash flow hedge gain (loss) to be reclassified within 12 months $ 87,000