Derivative instruments and hedging activities - Cash flow hedges and non-hedging derivatives outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Notional Amount Of Derivatives
Derivative, Notional Amount	$ 329,486	$ 267,232
Derivative Asset Fair Value Net
Deivatives assets	19,229	26,093
Derivative Liability Fair Value Net
Derivatives liabilities	17,000	22,878
Designated As Hedging Instrument Member
Notional Amount Of Derivatives
Derivative, Notional Amount	15,100	87,900
Derivative Asset Fair Value Net
Deivatives assets	93	18
Derivative Liability Fair Value Net
Derivatives liabilities	22	125
Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	314,386	179,332
Derivative Asset Fair Value Net
Deivatives assets	19,136	26,075
Derivative Liability Fair Value Net
Derivatives liabilities	16,978	22,753
Forward contracts \| Designated As Hedging Instrument Member
Notional Amount Of Derivatives
Derivative, Notional Amount	15,100	87,900
Forward contracts \| Designated As Hedging Instrument Member \| Other assets
Derivative Asset Fair Value Net
Deivatives assets	$ 93	$ 18
Derivative assets statement of financial position	Other assets	Other assets
Forward contracts \| Designated As Hedging Instrument Member \| Other liabilities
Derivative Liability Fair Value Net
Derivatives liabilities	$ 22	$ 125
Derivative liability statement of financial position	Other liabilities (includes $2,764 due to subsidiaries and affiliate (2021 - $6,591))	Other liabilities (includes $2,764 due to subsidiaries and affiliate (2021 - $6,591))
Interest rate cap \| Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	$ 150,000	$ 27,866
Interest rate cap \| Non designated as hedging instrument \| Other assets
Derivative Asset Fair Value Net
Deivatives assets	1,045	0
Interest rate cap \| Non designated as hedging instrument \| Other liabilities
Derivative Liability Fair Value Net
Derivatives liabilities	1,045	0
Indexed options on deposits \| Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	85,414	79,114
Indexed options on deposits \| Non designated as hedging instrument \| Other assets
Derivative Asset Fair Value Net
Deivatives assets	18,091	26,075
Bifurcated embedded options \| Non designated as hedging instrument
Notional Amount Of Derivatives
Derivative, Notional Amount	78,972	72,352
Bifurcated embedded options \| Non designated as hedging instrument \| Interest-bearing deposits
Derivative Liability Fair Value Net
Derivatives liabilities	$ 15,933	$ 22,753

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