Other comprehensive income (loss) (Activity in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	$ 432,452	$ 429,430	$ 357,168
BALANCE	459,886	432,452	429,430
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(33,616)	25	2,968
Other comprehensive income (loss)	4,754	(34,231)	(2,910)
Reclassification of amounts included in net income	5,044	590	(33)
Net other comprehensive income (loss) during period	9,798	(33,641)	(2,943)
BALANCE	(23,818)	(33,616)	25
AOCI, Available-for-Sale Securities Transfer to Held-to-Maturity [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(742)	665
Other comprehensive income (loss)		(1,490)	671
Reclassification of amounts included in net income	110	83	(6)
Net other comprehensive income (loss) during period	110	(1,407)	665
BALANCE	(632)	(742)	665
AOCI, Fair Value Municipal Security Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE		753	(785)
Other comprehensive income (loss)	(397)	(56)	1,538
Reclassification of amounts included in net income		(697)
Net other comprehensive income (loss) during period	(397)	(753)	1,538
BALANCE	(397)		753
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(966)
Other comprehensive income (loss)	(145)	(966)
Reclassification of amounts included in net income	51
Net other comprehensive income (loss) during period	(94)	(966)
BALANCE	(1,060)	(966)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	(35,324)	1,443	2,183
Other comprehensive income (loss)	4,212	(36,743)	(701)
Reclassification of amounts included in net income	5,205	(24)	(39)
Net other comprehensive income (loss) during period	9,417	(36,767)	(740)
BALANCE	$ (25,907)	$ (35,324)	$ 1,443