Derivative instruments and hedging activities - Cash flow hedges and non-hedging derivatives outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Notional Amount Of Derivatives
Derivative, Notional Amount	$ 286,563	$ 714,903
Derivative Asset Fair Value Net
Deivatives assets	26,023	24,419
Derivative Liability Fair Value Net
Derivatives liabilities	22,832	21,103
Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	286,563	714,903
Derivative Asset Fair Value Net
Deivatives assets	26,023	24,419
Derivative Liability Fair Value Net
Derivatives liabilities	22,832	21,103
Forward contracts | Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	11,150	14,930
Forward contracts | Non designated as hedging instrument | Trading account debt securities
Derivative Asset Fair Value Net
Deivatives assets	48	0
Forward contracts | Non designated as hedging instrument | Other liabilities
Derivative Liability Fair Value Net
Derivatives liabilities	1	138
Interest rate cap | Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	95,625	528,125
Interest rate cap | Non designated as hedging instrument | Other assets
Derivative Asset Fair Value Net
Deivatives assets	26	2,195
Interest rate cap | Non designated as hedging instrument | Other liabilities
Derivative Liability Fair Value Net
Derivatives liabilities	26	2,213
Indexed options on deposits | Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	93,510	89,730
Indexed options on deposits | Non designated as hedging instrument | Other assets
Derivative Asset Fair Value Net
Deivatives assets	25,949	22,224
Bifurcated embedded options | Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	86,278	82,118
Bifurcated embedded options | Non designated as hedging instrument | Interest-bearing deposits
Derivative Liability Fair Value Net
Derivatives liabilities	$ 22,805	$ 18,752