Other comprehensive income (loss) (Activity in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	$ 429,430	$ 357,168
BALANCE	420,042	364,058
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	25	2,968
Other comprehensive income (loss)	(15,092)	(2,070)
Net other comprehensive income (loss) during period	(15,092)	(2,070)
BALANCE	(15,067)	898
AOCI, Available-for-Sale Securities Transfer to Held-to-Maturity [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	665
Other comprehensive income (loss)	(1,490)
Reclassification of amounts included in net income	(8)
Net other comprehensive income (loss) during period	(1,498)
BALANCE	(833)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	753	(785)
Other comprehensive income (loss)	(409)	970
Net other comprehensive income (loss) during period	(409)	970
BALANCE	344	185
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	1,443	2,183
Other comprehensive income (loss)	(16,991)	(1,100)
Reclassification of amounts included in net income	(8)
Net other comprehensive income (loss) during period	(16,999)	(1,100)
BALANCE	$ (15,556)	$ 1,083