Changes in the allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Residential 1-4 family
Financing Receivable, Past Due [Line Items]
Beginning balance	$ 2,646	$ 2,393
Provision	(208)	306
Charge-offs	(9)
Recoveries	1	7
Ending balance	2,430	2,706
Residential 5+ multifamily
Financing Receivable, Past Due [Line Items]
Beginning balance	686	446
Provision	(64)	62
Charge-offs
Recoveries
Ending balance	622	508
Construction of residential 1-4 family
Financing Receivable, Past Due [Line Items]
Beginning balance	65	75
Provision	12	12
Charge-offs
Recoveries
Ending balance	77	87
Home equity lines of credit
Financing Receivable, Past Due [Line Items]
Beginning balance	252	197
Provision	(57)	81
Charge-offs
Recoveries
Ending balance	195	278
Residential real estate
Financing Receivable, Past Due [Line Items]
Beginning balance	3,649	3,111
Provision	(317)	461
Charge-offs	(9)
Recoveries	1	7
Ending balance	3,324	3,579
Commercial
Financing Receivable, Past Due [Line Items]
Beginning balance	6,546	3,742
Provision	530	758
Charge-offs	(6)
Recoveries	10	19
Ending balance	7,080	4,519
Construction of commercial
Financing Receivable, Past Due [Line Items]
Beginning balance	596	104
Provision	(12)	22
Charge-offs
Recoveries
Ending balance	584	126
Commercial real estate
Financing Receivable, Past Due [Line Items]
Beginning balance	7,142	3,846
Provision	518	780
Charge-offs	(6)
Recoveries	10	19
Ending balance	7,664	4,645
Farm land
Financing Receivable, Past Due [Line Items]
Beginning balance	59	47
Provision	(9)	5
Charge-offs
Recoveries
Ending balance	50	52
Vacant land
Financing Receivable, Past Due [Line Items]
Beginning balance	180	71
Provision	(71)	73
Charge-offs
Recoveries
Ending balance	109	144
Real estate secured
Financing Receivable, Past Due [Line Items]
Beginning balance	11,030	7,075
Provision	121	1,319
Charge-offs	(15)
Recoveries	11	26
Ending balance	11,147	8,420
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Beginning balance	1,397	1,145
Provision	(28)	(74)
Charge-offs
Recoveries
Ending balance	1,369	1,071
Municipal
Financing Receivable, Past Due [Line Items]
Beginning balance	43	46
Provision		7
Charge-offs
Recoveries
Ending balance	43	53
Consumer
Financing Receivable, Past Due [Line Items]
Beginning balance	77	60
Provision	(3)	51
Charge-offs	(24)	(12)
Recoveries	2	3
Ending balance	52	102
Unallocated
Financing Receivable, Past Due [Line Items]
Beginning balance	1,207	569
Provision	68	403
Charge-offs
Recoveries
Ending balance	1,275	972
Totals
Financing Receivable, Past Due [Line Items]
Beginning balance	13,754	8,895
Provision	158	1,706
Charge-offs	(39)	(12)
Recoveries	13	29
Ending balance	$ 13,886	$ 10,618