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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 | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Total loans | $ 1,039,638 |  | $ 1,039,638 |  | $ 1,038,271
Current period gross charge-offs, Total | 204 | $ 170 | 620 | $ 339 |
Other commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Total loans | 139,758 |  | 139,758 |  | 159,424
Current period gross charge-offs, Total | 132 | $ 75 | 424 | $ 75 |
Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Total loans | 241,519 |  | 241,519 |  | 240,286
Commercial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 70,493 |  | 70,493 |  | 128,219
2023/2022 | 135,084 |  | 135,084 |  | 120,075
2022/2021 | 104,518 |  | 104,518 |  | 126,424
2021/2020 | 114,894 |  | 114,894 |  | 70,567
2020/2019 | 67,162 |  | 67,162 |  | 66,896
Prior | 204,015 |  | 204,015 |  | 182,673
Revolving Loans Amortized to Basis | 56,786 |  | 56,786 |  | 65,703
Revolving Loans Converted to Term | 881 |  | 881 |  | 269
Total loans | 753,833 |  | 753,833 |  | 760,826
Current period gross charge-offs, 2023/2022 |  |  |  |  | 75
Current period gross charge-offs, 2022/2021 |  |  | 424 |  |
Current period gross charge-offs, 2020/2019 |  |  |  |  | 804
Current period gross charge-offs, Prior |  |  |  |  | 2,433
Current period gross charge-offs, Total |  |  | 424 |  | 3,312
Commercial | Commercial real estate (owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 3,991 |  | 3,991 |  | 17,801
2023/2022 | 17,674 |  | 17,674 |  | 6,750
2022/2021 | 6,105 |  | 6,105 |  | 15,531
2021/2020 | 12,419 |  | 12,419 |  | 8,415
2020/2019 | 10,836 |  | 10,836 |  | 12,574
Prior | 28,222 |  | 28,222 |  | 26,802
Revolving Loans Amortized to Basis | 383 |  | 383 |  | 1,274
Revolving Loans Converted to Term | 881 |  | 881 |  |
Total loans | 80,511 |  | 80,511 |  | 89,147
Commercial | Other commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 10,278 |  | 10,278 |  | 22,662
2023/2022 | 20,124 |  | 20,124 |  | 35,435
2022/2021 | 23,015 |  | 23,015 |  | 12,894
2021/2020 | 9,759 |  | 9,759 |  | 5,831
2020/2019 | 4,878 |  | 4,878 |  | 4,912
Prior | 22,473 |  | 22,473 |  | 21,165
Revolving Loans Amortized to Basis | 49,231 |  | 49,231 |  | 56,455
Revolving Loans Converted to Term |  |  |  |  | 70
Total loans | 139,758 |  | 139,758 |  | 159,424
Current period gross charge-offs, 2023/2022 |  |  |  |  | 75
Current period gross charge-offs, 2022/2021 |  |  | 424 |  |
Current period gross charge-offs, Prior |  |  |  |  | 405
Current period gross charge-offs, Total |  |  | 424 |  | 480
Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 12,928 |  | 12,928 |  | 35,545
2023/2022 | 39,137 |  | 39,137 |  | 23,682
2022/2021 | 21,463 |  | 21,463 |  | 33,110
2021/2020 | 32,227 |  | 32,227 |  | 23,146
2020/2019 | 22,520 |  | 22,520 |  | 9,226
Prior | 39,423 |  | 39,423 |  | 36,269
Revolving Loans Amortized to Basis | 978 |  | 978 |  | 983
Total loans | 168,676 |  | 168,676 |  | 161,961
Current period gross charge-offs, Prior |  |  |  |  | 2,028
Current period gross charge-offs, Total |  |  |  |  | 2,028
Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 17,567 |  | 17,567 |  | 22,620
2023/2022 | 27,106 |  | 27,106 |  | 16,767
2022/2021 | 16,515 |  | 16,515 |  | 16,622
2021/2020 | 16,951 |  | 16,951 |  | 13,007
2020/2019 | 12,546 |  | 12,546 |  | 10,916
Prior | 32,309 |  | 32,309 |  | 28,755
Revolving Loans Amortized to Basis | 375 |  | 375 |  | 1,321
Total loans | 123,369 |  | 123,369 |  | 110,008
Commercial | Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 25,729 |  | 25,729 |  | 29,591
2023/2022 | 31,043 |  | 31,043 |  | 37,441
2022/2021 | 37,420 |  | 37,420 |  | 48,267
2021/2020 | 43,538 |  | 43,538 |  | 20,168
2020/2019 | 16,382 |  | 16,382 |  | 29,268
Prior | 81,588 |  | 81,588 |  | 69,682
Revolving Loans Amortized to Basis | 5,819 |  | 5,819 |  | 5,670
Revolving Loans Converted to Term |  |  |  |  | 199
Total loans | 241,519 |  | 241,519 |  | 240,286
Current period gross charge-offs, 2020/2019 |  |  |  |  | 804
Current period gross charge-offs, Total |  |  |  |  | 804
Pass | Commercial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 70,446 |  | 70,446 |  | 128,219
2023/2022 | 135,084 |  | 135,084 |  | 118,099
2022/2021 | 103,167 |  | 103,167 |  | 125,833
2021/2020 | 109,220 |  | 109,220 |  | 69,601
2020/2019 | 66,234 |  | 66,234 |  | 57,123
Prior | 184,469 |  | 184,469 |  | 164,651
Revolving Loans Amortized to Basis | 55,606 |  | 55,606 |  | 64,716
Revolving Loans Converted to Term | 881 |  | 881 |  | 70
Total loans | 725,107 |  | 725,107 |  | 728,312
Pass | Commercial | Commercial real estate (owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 3,944 |  | 3,944 |  | 17,801
2023/2022 | 17,674 |  | 17,674 |  | 6,750
2022/2021 | 6,105 |  | 6,105 |  | 15,067
2021/2020 | 8,752 |  | 8,752 |  | 8,415
2020/2019 | 10,836 |  | 10,836 |  | 10,322
Prior | 27,617 |  | 27,617 |  | 26,538
Revolving Loans Amortized to Basis | 383 |  | 383 |  | 351
Revolving Loans Converted to Term | 881 |  | 881 |  |
Total loans | 76,192 |  | 76,192 |  | 85,244
Pass | Commercial | Other commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 10,278 |  | 10,278 |  | 22,662
2023/2022 | 20,124 |  | 20,124 |  | 34,816
2022/2021 | 22,597 |  | 22,597 |  | 12,767
2021/2020 | 7,951 |  | 7,951 |  | 5,831
2020/2019 | 4,878 |  | 4,878 |  | 4,912
Prior | 20,559 |  | 20,559 |  | 19,587
Revolving Loans Amortized to Basis | 48,051 |  | 48,051 |  | 56,391
Revolving Loans Converted to Term |  |  |  |  | 70
Total loans | 134,438 |  | 134,438 |  | 157,036
Pass | Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 12,928 |  | 12,928 |  | 35,545
2023/2022 | 39,137 |  | 39,137 |  | 23,368
2022/2021 | 21,155 |  | 21,155 |  | 33,110
2021/2020 | 32,227 |  | 32,227 |  | 23,146
2020/2019 | 22,520 |  | 22,520 |  | 9,226
Prior | 39,423 |  | 39,423 |  | 35,102
Revolving Loans Amortized to Basis | 978 |  | 978 |  | 983
Total loans | 168,368 |  | 168,368 |  | 160,480
Pass | Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 17,567 |  | 17,567 |  | 22,620
2023/2022 | 27,106 |  | 27,106 |  | 16,767
2022/2021 | 16,515 |  | 16,515 |  | 16,622
2021/2020 | 16,951 |  | 16,951 |  | 12,041
2020/2019 | 11,618 |  | 11,618 |  | 9,638
Prior | 30,938 |  | 30,938 |  | 28,632
Revolving Loans Amortized to Basis | 375 |  | 375 |  | 1,321
Total loans | 121,070 |  | 121,070 |  | 107,641
Pass | Commercial | Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 25,729 |  | 25,729 |  | 29,591
2023/2022 | 31,043 |  | 31,043 |  | 36,398
2022/2021 | 36,795 |  | 36,795 |  | 48,267
2021/2020 | 43,339 |  | 43,339 |  | 20,168
2020/2019 | 16,382 |  | 16,382 |  | 23,025
Prior | 65,932 |  | 65,932 |  | 54,792
Revolving Loans Amortized to Basis | 5,819 |  | 5,819 |  | 5,670
Total loans | 225,039 |  | 225,039 |  | 217,911
Special Mention | Commercial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023/2022 |  |  |  |  | 314
2022/2021 | 308 |  | 308 |  | 591
2021/2020 | 5,475 |  | 5,475 |  |
2020/2019 |  |  |  |  | 2,252
Prior | 4,034 |  | 4,034 |  | 4,944
Revolving Loans Amortized to Basis | 1,000 |  | 1,000 |  | 923
Total loans | 10,817 |  | 10,817 |  | 9,024
Special Mention | Commercial | Commercial real estate (owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2022/2021 |  |  |  |  | 464
2021/2020 | 3,667 |  | 3,667 |  |
2020/2019 |  |  |  |  | 2,252
Revolving Loans Amortized to Basis |  |  |  |  | 923
Total loans | 3,667 |  | 3,667 |  | 3,639
Special Mention | Commercial | Other commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2022/2021 |  |  |  |  | 127
2021/2020 | 1,808 |  | 1,808 |  |
Prior | 473 |  | 473 |  |
Revolving Loans Amortized to Basis | 1,000 |  | 1,000 |  |
Total loans | 3,281 |  | 3,281 |  | 127
Special Mention | Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023/2022 |  |  |  |  | 314
2022/2021 | 308 |  | 308 |  |
Prior |  |  |  |  | 1,167
Total loans | 308 |  | 308 |  | 1,481
Special Mention | Commercial | Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Prior | 3,561 |  | 3,561 |  | 3,777
Total loans | 3,561 |  | 3,561 |  | 3,777
Substandard | Commercial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 47 |  | 47 |  |
2023/2022 |  |  |  |  | 1,662
2022/2021 | 1,043 |  | 1,043 |  |
2021/2020 | 199 |  | 199 |  | 966
2020/2019 | 928 |  | 928 |  | 7,521
Prior | 15,512 |  | 15,512 |  | 13,078
Revolving Loans Amortized to Basis | 180 |  | 180 |  | 64
Revolving Loans Converted to Term |  |  |  |  | 199
Total loans | 17,909 |  | 17,909 |  | 23,490
Substandard | Commercial | Commercial real estate (owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2024/2023 | 47 |  | 47 |  |
Prior | 605 |  | 605 |  | 264
Total loans | 652 |  | 652 |  | 264
Substandard | Commercial | Other commercial and industrial |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023/2022 |  |  |  |  | 619
2022/2021 | 418 |  | 418 |  |
Prior | 1,441 |  | 1,441 |  | 1,578
Revolving Loans Amortized to Basis | 180 |  | 180 |  | 64
Total loans | 2,039 |  | 2,039 |  | 2,261
Substandard | Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2021/2020 |  |  |  |  | 966
2020/2019 | 928 |  | 928 |  | 1,278
Prior | 1,371 |  | 1,371 |  | 123
Total loans | 2,299 |  | 2,299 |  | 2,367
Substandard | Commercial | Other commercial real estate (non-owner occupied) |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023/2022 |  |  |  |  | 1,043
2022/2021 | 625 |  | 625 |  |
2021/2020 | 199 |  | 199 |  |
2020/2019 |  |  |  |  | 6,243
Prior | 12,095 |  | 12,095 |  | 11,113
Revolving Loans Converted to Term |  |  |  |  | 199
Total loans | $ 12,919 |  | $ 12,919 |  | $ 18,598

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