Derivative instruments and hedging activities - Non-hedging activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in income on derivatives	$ 7,746	$ 2,313	$ (2,982)
Forward contracts | Mortgage banking activities
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in income on derivatives	8,094	2,027	(5,027)
Indexed options on deposits | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in income on derivatives	(5,290)	6,824	5,462
Bifurcated embedded options | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of net gain (loss) recognized in income on derivatives	$ 4,942	$ (6,538)	$ (3,417)