Other comprehensive income (loss) (Activity in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	$ 443,399	$ 420,042	$ 432,452	$ 429,430
BALANCE	444,847	420,427	444,847	420,427
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(27,478)	(15,067)	(33,616)	25
Other comprehensive income (loss)	(5,654)	(8,459)	484	(23,551)
Net other comprehensive income (loss) during period	(5,654)	(8,459)	484	(23,551)
BALANCE	(33,132)	(23,526)	(33,132)	(23,526)
AOCI, Available-for-Sale Securities Transfer to Held-to-Maturity [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(712)	(833)	(742)	665
Other comprehensive income (loss)				(1,490)
Reclassification of amounts included in net income	28	29	58	21
Net other comprehensive income (loss) during period	28	29	58	(1,469)
BALANCE	(684)	(804)	(684)	(804)
AOCI, Fair Value Municipal Security Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE				753
Other comprehensive income (loss)				(1,071)
Net other comprehensive income (loss) during period				(1,071)
BALANCE		(318)		(318)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(430)		(966)
Other comprehensive income (loss)	(771)		(235)
Net other comprehensive income (loss) during period	(771)		(235)
BALANCE	(1,201)		(1,201)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(28,620)	(15,556)	(35,324)	1,443
Other comprehensive income (loss)	(6,425)	(9,121)	249	(26,112)
Reclassification of amounts included in net income	28	29	58	21
Net other comprehensive income (loss) during period	(6,397)	(9,092)	307	(26,091)
BALANCE	$ (35,017)	(24,648)	$ (35,017)	(24,648)
AOCI, Derivative Qualifying as Hedge, Excluded Component, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE		344
Other comprehensive income (loss)		(662)
Net other comprehensive income (loss) during period		(662)
BALANCE		$ (318)		$ (318)