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Loans and allowance for loan losses - Risk category of loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year $ 51,244    
One year prior 88,356   $ 88,151
Two years prior 101,165   100,297
Three years prior 89,380   96,010
Four years prior 46,738   48,576
Five years prior     29,814
Five years or more prior 158,495   146,610
Revolving 70,030   65,550
Total loans 605,408   575,008
Current-period gross write-offs      
Current year 11    
Total Current period gross writeoff 11 $ 7 33
Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 49,147   47,495
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 310,012   290,590
Consumer real estate secured by 1-4 family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 130,285   128,532
Residential | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 5,528    
One year prior 4,902   6,320
Two years prior 2,311   3,812
Three years prior 339   339
Total loans 13,080   10,471
Residential | Construction and land development | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 5,528    
One year prior 4,902   6,320
Two years prior 2,311   3,812
Three years prior 339   339
Total loans 13,080   10,471
Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 1,271    
One year prior 7,430   5,007
Two years prior 14,118   14,506
Three years prior 10,277   10,339
Four years prior 214   235
Five years or more prior 959   1,183
Revolving 1,798   5,754
Total loans 36,067   37,024
Commercial | Construction and land development | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 1,271    
One year prior 7,430   5,007
Two years prior 14,118   14,506
Three years prior 10,277   10,339
Four years prior 214   235
Five years or more prior 959   1,183
Revolving 1,798   5,754
Total loans 36,067   37,024
Owner occupied | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 8,890    
One year prior 12,906   11,945
Two years prior 24,293   22,048
Three years prior 19,014   20,117
Four years prior 9,617   9,855
Five years prior     12,145
Five years or more prior 53,438   45,768
Revolving 625   788
Total loans 128,783   122,666
Owner occupied | Commercial real estate | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 8,890    
One year prior 12,906   11,945
Two years prior 24,293   21,846
Three years prior 19,014   20,044
Four years prior 9,161   9,855
Five years prior     12,145
Five years or more prior 50,313   41,067
Revolving 625   788
Total loans 125,202   117,690
Owner occupied | Commercial real estate | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Two years prior     202
Three years prior     73
Four years prior 456    
Five years or more prior 3,125   4,701
Total loans 3,581   4,976
Non-owner occupied | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 9,535    
One year prior 9,379   9,468
Two years prior 28,949   25,607
Three years prior 30,171   30,628
Four years prior 23,128   23,567
Five years prior     9,528
Five years or more prior 56,983   52,745
Revolving 4,476   3,312
Total loans 162,621   154,855
Non-owner occupied | Commercial real estate | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 9,535    
One year prior 9,379   9,468
Two years prior 28,949   25,607
Three years prior 28,023   28,455
Four years prior 23,128   23,567
Five years prior     9,528
Five years or more prior 54,241   47,645
Revolving 4,476   3,312
Total loans 157,731   147,582
Non-owner occupied | Commercial real estate | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Three years prior 2,148   2,173
Five years or more prior 2,742   5,100
Total loans 4,890   7,273
Multifamily | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 5,250    
One year prior 1,300   1,300
Three years prior 2,363   2,503
Four years prior 537   548
Five years prior     885
Five years or more prior 6,751   6,113
Revolving 2,092   1,394
Total loans 18,293   12,743
Multifamily | Commercial real estate | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 5,250    
One year prior 1,300   1,300
Three years prior 2,363   2,503
Four years prior 537   548
Five years prior     885
Five years or more prior 6,751   6,113
Revolving 2,092   1,394
Total loans 18,293   12,743
Farmland | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 20   26
Revolving 295   300
Total loans 315   326
Farmland | Commercial real estate | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 20   26
Revolving 295   300
Total loans 315   326
Home equity lines | Consumer real estate secured by 1-4 family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Two years prior     446
Revolving 22,281   21,111
Total loans 22,281   21,557
Home equity lines | Consumer real estate secured by 1-4 family residential | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Two years prior     446
Revolving 22,206   21,036
Total loans 22,206   21,482
Home equity lines | Consumer real estate secured by 1-4 family residential | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revolving 75   75
Total loans 75   75
First deed of trust | Consumer real estate secured by 1-4 family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 7,483    
One year prior 30,394   34,067
Two years prior 14,148   14,288
Three years prior 14,019   15,613
Four years prior 7,834   8,277
Five years prior     2,957
Five years or more prior 19,194   18,311
Revolving 2,124   2,125
Total loans 95,196   95,638
First deed of trust | Consumer real estate secured by 1-4 family residential | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 7,483    
One year prior 30,394   34,067
Two years prior 14,148   14,288
Three years prior 14,019   15,613
Four years prior 7,834   8,107
Five years prior     2,957
Five years or more prior 18,826   17,427
Revolving 2,124   2,125
Total loans 94,828   94,584
First deed of trust | Consumer real estate secured by 1-4 family residential | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Four years prior     170
Five years or more prior 211   724
Total loans 211   894
First deed of trust | Consumer real estate secured by 1-4 family residential | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 157   160
Total loans 157   160
Second deed of trust | Consumer real estate secured by 1-4 family residential      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 1,855    
One year prior 4,377   4,530
Two years prior 2,996   3,207
Three years prior 989   1,027
Four years prior 375   397
Five years prior     1,112
Five years or more prior 1,669   798
Revolving 547   266
Total loans 12,808   11,337
Second deed of trust | Consumer real estate secured by 1-4 family residential | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 1,768    
One year prior 4,377   4,530
Two years prior 2,996   3,207
Three years prior 989   1,027
Four years prior 375   397
Five years prior     1,067
Five years or more prior 1,464   626
Revolving 547   266
Total loans 12,516   11,120
Second deed of trust | Consumer real estate secured by 1-4 family residential | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 87    
Five years prior     45
Five years or more prior 109   67
Total loans 196   112
Second deed of trust | Consumer real estate secured by 1-4 family residential | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 96   105
Total loans 96   105
Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 11,149    
One year prior 17,274   15,059
Two years prior 13,987   15,900
Three years prior 12,127   15,321
Four years prior 5,003   5,647
Five years prior     3,170
Five years or more prior 5,309   3,732
Revolving 32,514   27,374
Total loans 97,363   86,203
Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 11,149    
One year prior 17,274   15,022
Two years prior 13,894   15,900
Three years prior 12,044   15,321
Four years prior 5,003   5,634
Five years prior     2,852
Five years or more prior 5,135   3,698
Revolving 32,098   27,068
Total loans 96,597   85,495
Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
One year prior     37
Two years prior 93    
Five years prior     318
Five years or more prior 123   22
Revolving 416   306
Total loans 632   683
Commercial and industrial loans (except those secured by real estate) | Commercial and industrial loans | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Three years prior 83    
Four years prior     13
Five years or more prior 51   12
Total loans 134   25
Guaranteed student loans | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 14,156   17,923
Total loans 14,156   17,923
Current-period gross write-offs      
Current year 11    
One year prior     30
Total Current period gross writeoff 11 $ 7 30
Guaranteed student loans | Commercial and industrial loans | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Five years or more prior 14,156   17,923
Total loans 14,156   17,923
Consumer and other | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 283    
One year prior 394   455
Two years prior 363   483
Three years prior 81   123
Four years prior 30   50
Five years prior     17
Five years or more prior 16   11
Revolving 3,278   3,126
Total loans 4,445   4,265
Current-period gross write-offs      
One year prior     3
Total Current period gross writeoff     3
Consumer and other | Commercial and industrial loans | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current year 283    
One year prior 394   455
Two years prior 363   483
Three years prior 81   123
Four years prior 30   50
Five years prior     17
Five years or more prior 16   11
Revolving 3,278   3,126
Total loans $ 4,445   $ 4,265