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Allowance for Credit Losses - Loans - Commercial and commercial real estate loan portfolios (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 1,002,306   $ 1,002,306   $ 990,766
Current period gross charge-offs, Total 170 $ 1,423 339 $ 1,604  
Loan portfolio         990,766
Paycheck Protection Program (PPP)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         22
Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 144,806   144,806    
Current period gross charge-offs, Total 75   75    
Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 229,885   229,885    
Residential mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 174,419   174,419    
Current period gross charge-offs, Total 54 9 54 32  
Loan portfolio         297,971
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 91,134   91,134    
2022 120,825   120,825    
2021 127,381   127,381    
2020 71,832   71,832    
2019 68,854   68,854    
Prior 196,646   196,646    
Revolving Loans Amortized Cost Basis 49,512   49,512    
Revolving Loans Converted to Term 199   199    
Total 726,383   726,383    
Current period gross charge-offs, 2022     75    
Current period gross charge-offs, Total     75    
Loan portfolio         679,322
Commercial | Commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         153,398
Commercial | Commercial and industrial.          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         153,398
Commercial | Paycheck Protection Program (PPP)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         22
Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 15,059   15,059    
2022 6,936   6,936    
2021 15,730   15,730    
2020 8,581   8,581    
2019 12,721   12,721    
Prior 28,192   28,192    
Revolving Loans Amortized Cost Basis 1,239   1,239    
Total 88,458   88,458    
Loan portfolio         75,158
Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 13,691   13,691    
2022 37,271   37,271    
2021 13,509   13,509    
2020 6,425   6,425    
2019 5,547   5,547    
Prior 22,402   22,402    
Revolving Loans Amortized Cost Basis 45,961   45,961    
Total 144,806   144,806    
Current period gross charge-offs, 2022     75    
Current period gross charge-offs, Total     75    
Commercial | Commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Current period gross charge-offs, Total   1,390   1,390  
Loan portfolio         450,744
Commercial | Commercial real estate (non-owner occupied) - retail          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 25,300   25,300    
2022 23,906   23,906    
2021 33,398   33,398    
2020 23,355   23,355    
2019 9,322   9,322    
Prior 42,373   42,373    
Revolving Loans Amortized Cost Basis 983   983    
Total 158,637   158,637    
Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 14,145   14,145    
2022 16,789   16,789    
2021 16,487   16,487    
2020 13,117   13,117    
2019 10,984   10,984    
Prior 32,724   32,724    
Revolving Loans Amortized Cost Basis 351   351    
Total 104,597   104,597    
Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 22,939   22,939    
2022 35,923   35,923    
2021 48,257   48,257    
2020 20,354   20,354    
2019 30,280   30,280    
Prior 70,955   70,955    
Revolving Loans Amortized Cost Basis 978   978    
Revolving Loans Converted to Term 199   199    
Total 229,885   229,885    
Consumer.          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 21,398   21,398    
2022 33,757   33,757    
2021 72,191   72,191    
2020 48,310   48,310    
2019 8,465   8,465    
Prior 43,164   43,164    
Revolving Loans Amortized Cost Basis 48,022   48,022    
Revolving Loans Converted to Term 616   616    
Total 275,923   275,923    
Current period gross charge-offs, 2023     8    
Current period gross charge-offs, 2022     35    
Current period gross charge-offs, 2021     17    
Current period gross charge-offs, 2020     1    
Current period gross charge-offs, 2019     3    
Current period gross charge-offs, Prior     200    
Current period gross charge-offs, Total     264    
Loan portfolio         311,444
Consumer. | Residential mortgage          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 11,097   11,097    
2022 12,015   12,015    
2021 61,839   61,839    
2020 44,856   44,856    
2019 7,154   7,154    
Prior 37,458   37,458    
Total 174,419   174,419    
Current period gross charge-offs, Prior     54    
Current period gross charge-offs, Total     54    
Loan portfolio         297,971
Consumer. | Consumer          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 10,301   10,301    
2022 21,742   21,742    
2021 10,352   10,352    
2020 3,454   3,454    
2019 1,311   1,311    
Prior 5,706   5,706    
Revolving Loans Amortized Cost Basis 48,022   48,022    
Revolving Loans Converted to Term 616   616    
Total 101,504   101,504    
Current period gross charge-offs, 2023     8    
Current period gross charge-offs, 2022     35    
Current period gross charge-offs, 2021     17    
Current period gross charge-offs, 2020     1    
Current period gross charge-offs, 2019     3    
Current period gross charge-offs, Prior     146    
Current period gross charge-offs, Total 41 $ 24 210 $ 110  
Loan portfolio         13,473
Pass | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 91,134   91,134    
2022 119,600   119,600    
2021 126,785   126,785    
2020 70,854   70,854    
2019 59,549   59,549    
Prior 178,899   178,899    
Revolving Loans Amortized Cost Basis 46,371   46,371    
Total 693,192   693,192    
Loan portfolio         646,056
Pass | Commercial | Commercial and industrial.          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         148,361
Pass | Commercial | Paycheck Protection Program (PPP)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         22
Pass | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 15,059   15,059    
2022 6,936   6,936    
2021 15,265   15,265    
2020 8,581   8,581    
2019 10,463   10,463    
Prior 27,086   27,086    
Revolving Loans Amortized Cost Basis 456   456    
Total 83,846   83,846    
Loan portfolio         74,187
Pass | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 13,691   13,691    
2022 37,112   37,112    
2021 13,378   13,378    
2020 6,425   6,425    
2019 5,547   5,547    
Prior 20,960   20,960    
Revolving Loans Amortized Cost Basis 43,603   43,603    
Total 140,716   140,716    
Pass | Commercial | Commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         423,486
Pass | Commercial | Commercial real estate (non-owner occupied) - retail          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 25,300   25,300    
2022 23,906   23,906    
2021 33,398   33,398    
2020 23,355   23,355    
2019 9,322   9,322    
Prior 42,373   42,373    
Revolving Loans Amortized Cost Basis 983   983    
Total 158,637   158,637    
Pass | Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 14,145   14,145    
2022 16,789   16,789    
2021 16,487   16,487    
2020 12,139   12,139    
2019 10,984   10,984    
Prior 32,602   32,602    
Revolving Loans Amortized Cost Basis 351   351    
Total 103,497   103,497    
Pass | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 22,939   22,939    
2022 34,857   34,857    
2021 48,257   48,257    
2020 20,354   20,354    
2019 23,233   23,233    
Prior 55,878   55,878    
Revolving Loans Amortized Cost Basis 978   978    
Total 206,496   206,496    
Special Mention | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2021 596   596    
2019 2,258   2,258    
Prior 3,847   3,847    
Revolving Loans Amortized Cost Basis 2,655   2,655    
Total 9,356   9,356    
Loan portfolio         11,015
Special Mention | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2021 465   465    
2019 2,258   2,258    
Revolving Loans Amortized Cost Basis 783   783    
Total 3,506   3,506    
Special Mention | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2021 131   131    
Revolving Loans Amortized Cost Basis 1,872   1,872    
Total 2,003   2,003    
Special Mention | Commercial | Commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         11,015
Special Mention | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Prior 3,847   3,847    
Total 3,847   3,847    
Substandard | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2022 1,225   1,225    
2020 978   978    
2019 7,047   7,047    
Prior 13,899   13,899    
Revolving Loans Amortized Cost Basis 486   486    
Revolving Loans Converted to Term 199   199    
Total 23,834   23,834    
Loan portfolio         22,248
Substandard | Commercial | Commercial and industrial.          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         5,037
Substandard | Commercial | Commercial real estate (owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Prior 1,106   1,106    
Total 1,106   1,106    
Loan portfolio         971
Substandard | Commercial | Other commercial and industrial          
Financing Receivable, Credit Quality Indicator [Line Items]          
2022 159   159    
Prior 1,442   1,442    
Revolving Loans Amortized Cost Basis 486   486    
Total 2,087   2,087    
Substandard | Commercial | Commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         16,240
Substandard | Commercial | Commercial real estate (non-owner occupied) - multi-family          
Financing Receivable, Credit Quality Indicator [Line Items]          
2020 978   978    
Prior 122   122    
Total 1,100   1,100    
Substandard | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
2022 1,066   1,066    
2019 7,047   7,047    
Prior 11,229   11,229    
Revolving Loans Converted to Term 199   199    
Total 19,541   19,541    
Doubtful | Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Prior 1   1    
Total 1   1    
Loan portfolio         3
Doubtful | Commercial | Commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loan portfolio         $ 3
Doubtful | Commercial | Other commercial real estate (non-owner occupied)          
Financing Receivable, Credit Quality Indicator [Line Items]          
Prior 1   1    
Total $ 1   $ 1