Loans and Allowance for loan losses (Schedule of classes of the loan portfolio by the aging categories of performing loans and nonaccrual loans) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	$ 853,458,000	$ 876,616,000
Nonaccrual	6,689,000	6,335,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	839,966,000	858,608,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	6,697,000	11,616,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,643,000	1,853,000
Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	5,152,000	4,539,000
Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	382,088,000	376,260,000
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	311,589,000	284,120,000
Commercial real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	10,095,000	5,392,000
Commercial real estate | Construction | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	10,095,000	5,392,000
Commercial real estate | Non-residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	245,568,000	248,349,000
Nonaccrual	2,721,000	1,944,000
Commercial real estate | Non-residential | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	242,205,000	244,387,000
Commercial real estate | Non-residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	115,000	1,985,000
Commercial real estate | Non-residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	527,000	33,000
Commercial real estate | Non-residential | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,721,000	1,944,000
Commercial real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	55,926,000	30,379,000
Commercial real estate | Multifamily | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	55,926,000	30,379,000
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	35,646,000	39,239,000
Nonaccrual	2,230,000	2,641,000
Residential | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	34,363,000	36,581,000
Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	57,000	1,351,000
Residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	242,000	138,000
Residential | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	984,000	1,169,000
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	104,323,000	154,016,000
Nonaccrual	687,000	366,000
Commercial and industrial | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	103,517,000	151,771,000
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	246,000	1,551,000
Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		511,000
Commercial and industrial | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	560,000	183,000
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	19,812,000	22,981,000
Consumer | Indirect automobile
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	382,088,000	376,260,000
Nonaccrual	734,000	990,000
Consumer | Indirect automobile | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	374,729,000	367,929,000
Consumer | Indirect automobile | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	5,977,000	6,321,000
Consumer | Indirect automobile | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	715,000	1,063,000
Consumer | Indirect automobile | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	667,000	947,000
Consumer | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	11,857,000	14,165,000
Nonaccrual	270,000	346,000
Consumer | Home equity | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	11,429,000	13,506,000
Consumer | Home equity | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	149,000	310,000
Consumer | Home equity | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	106,000	101,000
Consumer | Home equity | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	173,000	248,000
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total gross loans	7,955,000	8,816,000
Nonaccrual	47,000	48,000
Consumer | Other consumer | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,702,000	8,663,000
Consumer | Other consumer | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	153,000	98,000
Consumer | Other consumer | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	53,000	7,000
Consumer | Other consumer | Greater Than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 47,000	$ 48,000