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Loans and allowance for loan losses (Allowance For Loan Losses And Recorded Investment In Loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Credit Losses: Beginning Balance $ 7,156 $ 4,829
Allowance for Credit Losses: Charge-Offs (91) (448)
Allowance for Credit Losses: Recoveries 350 227
Allowance for credit losses: Provision (500) 2,548
Allowance for Credit Losses: Ending Balance 6,915 7,156
Allowance for Credit Losses: Ending Balance: Individually evaluated for impairment   4
Allowance for Credit Losses: Ending Balance: Collectively evaluated for impairment 6,915 7,152
Allowance for Credit Losses: Totals 6,915 7,156
Financing Receivables: Ending Balance: Individually evaluated for impairment 4,086 4,817
Financing Receivables: Ending Balance: Collectively evaluated for impairment 579,298 604,273
Financing Receivable, before Allowance for Credit Loss, Total 583,384 609,090
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Credit Losses: Beginning Balance 2,001 1,330
Allowance for Credit Losses: Charge-Offs (53) (96)
Allowance for Credit Losses: Recoveries 112 20
Allowance for credit losses: Provision (589) 747
Allowance for Credit Losses: Ending Balance 1,471 2,001
Allowance for Credit Losses: Ending Balance: Individually evaluated for impairment   4
Allowance for Credit Losses: Ending Balance: Collectively evaluated for impairment 1,471 1,997
Allowance for Credit Losses: Totals 1,471 2,001
Financing Receivables: Ending Balance: Individually evaluated for impairment 17 345
Financing Receivables: Ending Balance: Collectively evaluated for impairment 105,050 144,800
Financing Receivable, before Allowance for Credit Loss, Total 105,067 145,145
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Credit Losses: Beginning Balance 3,550 1,932
Allowance for Credit Losses: Charge-Offs   (224)
Allowance for Credit Losses: Recoveries 72 139
Allowance for credit losses: Provision 15 1,703
Allowance for Credit Losses: Ending Balance 3,637 3,550
Allowance for Credit Losses: Ending Balance: Collectively evaluated for impairment 3,637 3,550
Allowance for Credit Losses: Totals 3,637 3,550
Financing Receivables: Ending Balance: Individually evaluated for impairment 2,694 2,782
Financing Receivables: Ending Balance: Collectively evaluated for impairment 335,455 306,781
Financing Receivable, before Allowance for Credit Loss, Total 338,149 309,563
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Credit Losses: Beginning Balance 868 865
Allowance for Credit Losses: Charge-Offs (38) (75)
Allowance for Credit Losses: Recoveries 29 53
Allowance for credit losses: Provision 1 25
Allowance for Credit Losses: Ending Balance 860 868
Allowance for Credit Losses: Ending Balance: Collectively evaluated for impairment 860 868
Allowance for Credit Losses: Totals 860 868
Financing Receivables: Ending Balance: Individually evaluated for impairment 59 343
Financing Receivables: Ending Balance: Collectively evaluated for impairment 89,043 92,001
Financing Receivable, before Allowance for Credit Loss, Total 89,102 92,344
Residential [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for Credit Losses: Beginning Balance 737 702
Allowance for Credit Losses: Charge-Offs   (53)
Allowance for Credit Losses: Recoveries 137 15
Allowance for credit losses: Provision 73 73
Allowance for Credit Losses: Ending Balance 947 737
Allowance for Credit Losses: Ending Balance: Collectively evaluated for impairment 947 737
Allowance for Credit Losses: Totals 947 737
Financing Receivables: Ending Balance: Individually evaluated for impairment 1,316 1,347
Financing Receivables: Ending Balance: Collectively evaluated for impairment 49,750 60,691
Financing Receivable, before Allowance for Credit Loss, Total $ 51,066 $ 62,038