Loans (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses
Beginning balance				$ 14,487				$ 13,592	$ 14,487	$ 13,592	$ 12,315
Provision for loan losses	$ 3,000	$ 2,600	$ 2,400	1,100	$ 600	$ 550	$ 750	550	9,100	2,450	3,000
Loans charged off									(2,053)	(2,347)	(2,856)
Recoveries									610	792	1,133
Ending balance	22,144				14,487				22,144	14,487	13,592
Commercial real estate
Allowance for loan losses
Beginning balance				5,843				5,036	5,843	5,036	4,260
Provision for loan losses									4,745	848	650
Loans charged off									(122)	(45)	0
Recoveries									31	4	126
Ending balance	10,497				5,843				10,497	5,843	5,036
Commercial
Allowance for loan losses
Beginning balance				2,323				2,093	2,323	2,093	2,011
Provision for loan losses									2,998	417	112
Loans charged off									(412)	(200)	(220)
Recoveries									11	13	190
Ending balance	4,920				2,323				4,920	2,323	2,093
Residential real estate
Allowance for loan losses
Beginning balance				2,875				2,837	2,875	2,837	2,521
Provision for loan losses									748	380	486
Loans charged off									(172)	(400)	(318)
Recoveries									85	58	148
Ending balance	3,536				2,875				3,536	2,875	2,837
Consumer
Allowance for loan losses
Beginning balance				2,710				2,963	2,710	2,963	2,848
Provision for loan losses									677	732	1,764
Loans charged off									(1,347)	(1,702)	(2,318)
Recoveries									483	717	669
Ending balance	2,523				2,710				2,523	2,710	2,963
Unallocated
Allowance for loan losses
Beginning balance				$ 736				$ 663	736	663	675
Provision for loan losses									(68)	73	(12)
Loans charged off									0	0	0
Recoveries									0	0	0
Ending balance	$ 668				$ 736				$ 668	$ 736	$ 663