Composition of loans receivable by delinquency status - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans Receivable Delinquency Status Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	$ 351,642	$ 344,085
Residential 5+ multifamily	35,019	34,594
Construction of residential 1-4 family	11,899	11,889
Home equity lines of credit	28,611	33,522
Residential real estate	427,171	424,090
Commercial	307,209	289,103
Construction of commercial	24,687	8,466
Commercial real estate	331,896	297,569
Farm land	3,134	3,461
Vacant land	13,694	7,852
Real estate secured	775,895	732,972
Commercial and industrial	236,790	169,262
Municipal	20,797	21,914
Consumer	7,637	6,382
Loans receivable, gross	1,041,119	930,530
Loans Receivable Delinquency Status Period Two [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	122	971
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	29	152
Residential real estate	151	1,123
Commercial	864	336
Construction of commercial
Commercial real estate	864	336
Farm land	161	180
Vacant land
Real estate secured	1,176	1,639
Commercial and industrial	250	2
Municipal
Consumer	49
Loans receivable, gross	1,475	1,641
Loans Receivable Delinquency Status Period Three [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	440	351
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	46	46
Residential real estate	486	397
Commercial	147	141
Construction of commercial
Commercial real estate	147	141
Farm land
Vacant land		41
Real estate secured	633	579
Commercial and industrial		146
Municipal
Consumer		1
Loans receivable, gross	633	726
Loans Receivable Delinquency Status Period Four [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	257	200
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit	71
Residential real estate	328	200
Commercial		71
Construction of commercial
Commercial real estate		71
Farm land
Vacant land
Real estate secured	328	271
Commercial and industrial	300	1
Municipal
Consumer		2
Loans receivable, gross	628	274
Loans Receivable Delinquency Status Period Five [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	86	692
Residential 5+ multifamily	861	861
Construction of residential 1-4 family
Home equity lines of credit	138	78
Residential real estate	1,085	1,631
Commercial	505	144
Construction of commercial
Commercial real estate	505	144
Farm land
Vacant land
Real estate secured	1,590	1,775
Commercial and industrial	108
Municipal
Consumer
Loans receivable, gross	1,698	1,775
Loans Receivable Delinquency Status Period Six [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	905	2,214
Residential 5+ multifamily	861	861
Construction of residential 1-4 family
Home equity lines of credit	284	276
Residential real estate	2,050	3,351
Commercial	1,516	692
Construction of commercial
Commercial real estate	1,516	692
Farm land	161	180
Vacant land		41
Real estate secured	3,727	4,264
Commercial and industrial	658	149
Municipal
Consumer	49	3
Loans receivable, gross	4,434	4,416
Loans Receivable Delinquency Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family
Residential 5+ multifamily
Construction of residential 1-4 family
Home equity lines of credit
Residential real estate
Commercial
Construction of commercial
Commercial real estate
Farm land
Vacant land
Real estate secured
Commercial and industrial	11	1
Municipal
Consumer		2
Loans receivable, gross	11	3
Loans Receivable Delinquency Non Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential 1-4 family	1,353	1,551
Residential 5+ multifamily	861	861
Construction of residential 1-4 family
Home equity lines of credit	233	105
Residential real estate	2,447	2,517
Commercial	1,262	914
Construction of commercial
Commercial real estate	1,262	914
Farm land	166	186
Vacant land	38
Real estate secured	3,913	3,617
Commercial and industrial	757
Municipal
Consumer
Loans receivable, gross	$ 4,670	$ 3,617