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Loans and allowance for loan losses (Age Analysis Of Past Due Financing Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	$ 583,384	$ 609,090
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	2,841	1,338
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	5	386
Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	807	1,675
Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	3,653	3,399
Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	579,731	605,691
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	105,067	145,145
Commercial [Member] | 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance		157
Commercial [Member] | 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	1
Commercial [Member] | Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	25
Commercial [Member] | Total Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	26	157
Commercial [Member] | Current [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	105,041	144,988
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	338,149	309,563
Commercial Real Estate [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	128,834	108,222
Commercial Real Estate [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	179,113	171,069
Commercial Real Estate [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	30,202	30,272
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	464	38
Commercial Real Estate [Member] | 30 to 59 Days Past Due [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	1,310	252
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance		116
Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	501	842
Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance		394
Commercial Real Estate [Member] | Total Past Due [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	965	880
Commercial Real Estate [Member] | Total Past Due [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	1,310	762
Commercial Real Estate [Member] | Current [Member] | Commercial Mortgages-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	127,869	107,342
Commercial Real Estate [Member] | Current [Member] | Commercial Mortgages-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	177,803	170,307
Commercial Real Estate [Member] | Current [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	30,202	30,272
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	89,102	92,344
Consumer [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	2,605	3,771
Consumer [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	86,497	88,573
Consumer [Member] | 30 to 59 Days Past Due [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	8	7
Consumer [Member] | 30 to 59 Days Past Due [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	111	309
Consumer [Member] | 60 to 89 Days Past Due [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	1
Consumer [Member] | 60 to 89 Days Past Due [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	3	27
Consumer [Member] | Greater than 90 Days Past Due [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	118	229
Consumer [Member] | Total Past Due [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	9	7
Consumer [Member] | Total Past Due [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	232	565
Consumer [Member] | Current [Member] | Consumer Unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	2,596	3,764
Consumer [Member] | Current [Member] | Consumer Secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	86,265	88,008
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	51,066	62,038
Residential [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	31,925	46,896
Residential [Member] | Residential Consumer Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	19,141	15,142
Residential [Member] | 30 to 59 Days Past Due [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	948	575
Residential [Member] | 60 to 89 Days Past Due [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance		243
Residential [Member] | Greater than 90 Days Past Due [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	163	210
Residential [Member] | Total Past Due [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	1,111	1,028
Residential [Member] | Current [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	30,814	45,868
Residential [Member] | Current [Member] | Residential Consumer Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal balance	$ 19,141	$ 15,142

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