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Derivative instruments and hedging activities - Cash flow hedges and non-hedging derivatives outstanding (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Notional Amount Of Derivatives    
Derivative, Notional Amount $ 714,903 $ 329,486
Derivative Asset Fair Value Net    
Deivatives assets 24,419 19,229
Derivative Liability Fair Value Net    
Derivatives liabilities 21,103 17,000
Designated As Hedging Instrument Member    
Notional Amount Of Derivatives    
Derivative, Notional Amount 0 15,100
Derivative Asset Fair Value Net    
Deivatives assets 0 93
Derivative Liability Fair Value Net    
Derivatives liabilities 0 22
Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 714,903 314,386
Derivative Asset Fair Value Net    
Deivatives assets 24,419 19,136
Derivative Liability Fair Value Net    
Derivatives liabilities 21,103 16,978
Forward contracts | Designated As Hedging Instrument Member    
Notional Amount Of Derivatives    
Derivative, Notional Amount 0 15,100
Forward contracts | Designated As Hedging Instrument Member | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 0 93
Forward contracts | Designated As Hedging Instrument Member | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 0 22
Forward contracts | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 14,930 0
Forward contracts | Non designated as hedging instrument | Trading account debt securities    
Notional Amount Of Derivatives    
Derivative, Notional Amount 0 0
Forward contracts | Non designated as hedging instrument | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 138 0
Interest rate cap | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 528,125 150,000
Interest rate cap | Non designated as hedging instrument | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 2,195 1,045
Interest rate cap | Non designated as hedging instrument | Other liabilities    
Derivative Liability Fair Value Net    
Derivatives liabilities 2,213 1,045
Indexed options on deposits | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 89,730 85,414
Indexed options on deposits | Non designated as hedging instrument | Other assets    
Derivative Asset Fair Value Net    
Deivatives assets 22,224 18,091
Bifurcated embedded options | Non designated as hedging instrument    
Notional Amount Of Derivatives    
Derivative, Notional Amount 82,118 78,972
Bifurcated embedded options | Non designated as hedging instrument | Interest-bearing deposits    
Derivative Liability Fair Value Net    
Derivatives liabilities $ 18,752 $ 15,933