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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 |  |

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