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Derivative instruments and hedging activities - Non-hedging activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives $ 1,512 $ 7,746 $ 2,313
Forward contracts | Mortgage banking activities      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 655 8,094 2,027
Interest rate cap | Other operating income      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives (18) 0 0
Indexed options on deposits | Interest expense on deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives 6,201 (5,290) 6,824
Bifurcated embedded options | Interest expense on deposits      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of net gain (loss) recognized in income on derivatives $ (5,326) $ 4,942 $ (6,538)