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Allowance for Credit Losses - Loans - Allowance for credit losses by loan portfolio segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | $ 14,420,000 | $ 12,313,000 | $ 14,420,000 | $ 12,313,000 | $ 15,053,000 | $ 14,611,000 | $ 12,221,000 |  | $ 10,743,000
Charge-Offs | (204,000) | (170,000) | (620,000) | (339,000) |  |  |  |  |
Recoveries | 48,000 | 44,000 | 132,000 | 152,000 |  |  |  |  |
Provision (Recovery) | (35,000) | 218,000 | (145,000) | 553,000 |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  |  | $ 1,200,000 |
Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 1,204,000 |  | 1,204,000 |  |  |  |  |
Other commercial and industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 2,438,000 | 2,744,000 | 2,438,000 | 2,744,000 | 3,030,000 | 2,678,000 | 2,849,000 |  |
Charge-Offs | (132,000) | (75,000) | (424,000) | (75,000) |  |  |  |  |
Recoveries | 12,000 |  | 33,000 | 2,000 |  |  |  |  |
Provision (Recovery) | (120,000) | (30,000) | (201,000) | (91,000) |  |  |  |  |
Other commercial and industrial | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 2,908,000 |  | 2,908,000 |  |  |  |  |
Other commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 4,641,000 | 3,183,000 | 4,641,000 | 3,183,000 | 3,428,000 | 4,665,000 | 3,087,000 |  | 5,972,000
Recoveries | 3,000 | 4,000 | 8,000 | 11,000 |  |  |  |  |
Provision (Recovery) | (27,000) | 92,000 | 1,205,000 | (24,000) |  |  |  |  |
Other commercial real estate (non-owner occupied) | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | (2,776,000) |  | (2,776,000) |  |  |  |  |
Residential mortgages |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 852,000 | 1,027,000 | 852,000 | 1,027,000 | 1,021,000 | 852,000 | 1,037,000 |  | 1,380,000
Charge-Offs |  | (54,000) |  | (54,000) |  |  |  |  |
Recoveries | 2,000 | 9,000 | 5,000 | 12,000 |  |  |  |  |
Provision (Recovery) | (2,000) | 35,000 | (174,000) | 44,000 |  |  |  |  |
Residential mortgages | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | (355,000) |  | (355,000) |  |  |  |  |
Allocation for general risk |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  |  |  | 653,000
Allocation for general risk | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | (653,000) |  | (653,000) |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (424,000) |  | (3,312,000) |  |  |  |
Commercial | Commercial real estate (owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 432,000 | 1,544,000 | 432,000 | 1,544,000 | 1,529,000 | 371,000 | 1,517,000 |  |
Recoveries | 6,000 | 6,000 | 18,000 | 18,000 |  |  |  |  |
Provision (Recovery) | 55,000 | 21,000 | (1,115,000) | 146,000 |  |  |  |  |
Commercial | Commercial real estate (owner occupied) | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 1,380,000 |  | 1,380,000 |  |  |  |  |
Commercial | Other commercial and industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (424,000) |  | (480,000) |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 3,451,000 | 1,526,000 | 3,451,000 | 1,526,000 | 3,488,000 | 3,519,000 | 1,477,000 |  |
Charge-Offs |  |  |  |  | (2,028,000) |  |  |  |
Provision (Recovery) | (68,000) | 49,000 | (37,000) | 94,000 |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - retail | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 1,432,000 |  | 1,432,000 |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,423,000 | 1,175,000 | 1,423,000 | 1,175,000 | 1,430,000 | 1,370,000 | 1,145,000 |  |
Recoveries |  | 2,000 | 3,000 | 5,000 |  |  |  |  |
Provision (Recovery) | 53,000 | 28,000 | (10,000) | (56,000) |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - multi-family | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 1,226,000 |  | 1,226,000 |  |  |  |  |
Commercial | Other commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  |  |  | (804,000) |  |  |  |
Commercial | Commercial (owner occupied real estate and other) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  |  |  | 2,653,000
Commercial | Commercial (owner occupied real estate and other) | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | (2,653,000) |  | (2,653,000) |  |  |  |  |
Consumer |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (196,000) |  | (329,000) |  |  |  |
Consumer | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  | 1,430,000 |  |  |  |
Consumer | Residential mortgages |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  |  |  | (54,000) |  |  |  |
Consumer | Consumer |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,183,000 | 1,114,000 | 1,183,000 | 1,114,000 | 1,127,000 | $ 1,156,000 | $ 1,109,000 |  | $ 85,000
Charge-Offs | (72,000) | (41,000) | (196,000) | (210,000) | $ (275,000) |  |  |  |
Recoveries | 25,000 | 23,000 | 65,000 | 104,000 |  |  |  |  |
Provision (Recovery) | $ 74,000 | 23,000 | $ 187,000 | 440,000 |  |  |  |  |
Consumer | Consumer | Cumulative Effect, Period of Adoption, Adjustment | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | $ 695,000 |  | $ 695,000 |  |  |  |  |

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