Goodwill and other intangible assets - Components of other intangible assets subject to amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 27,096	$ 27,096
Accumulated Amortization	14,118	11,637
Net Carrying Value	12,978	15,459
Core deposits
Finite-Lived Intangible Assets
Gross Carrying Amount	12,810	12,810
Accumulated Amortization	9,714	8,754
Net Carrying Value	3,096	4,056
Other customer relationship
Finite-Lived Intangible Assets
Gross Carrying Amount	14,286	14,286
Accumulated Amortization	4,404	2,883
Net Carrying Value	$ 9,882	$ 11,403