Other comprehensive income (loss) (Activity in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	$ 373,393	$ 343,488	$ 357,168	$ 312,747
BALANCE	424,720	349,789	424,720	349,789
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	2,051	2,668	2,968	391
Other comprehensive income (loss)	210	(65)	(707)	2,201
Reclassification of amounts included in net income	(33)	(7)	(33)	4
Net other comprehensive income (loss) during period	177	(72)	(740)	2,205
BALANCE	2,228	2,596	2,228	2,596
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	287	(2,076)	(785)	(223)
Other comprehensive income (loss)	44	492	1,116	(1,361)
Net other comprehensive income (loss) during period	44	492	1,116	(1,361)
BALANCE	331	(1,584)	331	(1,584)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
BALANCE	2,338	592	2,183	168
Other comprehensive income (loss)	254	427	409	840
Reclassification of amounts included in net income	(33)	(7)	(33)	4
Net other comprehensive income (loss) during period	221	420	376	844
BALANCE	$ 2,559	$ 1,012	$ 2,559	$ 1,012