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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 |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | $ 12,313,000 | $ 10,672,000 | $ 12,313,000 | $ 10,672,000 | $ 12,221,000 | $ 11,947,000 | $ 10,743,000 | $ 11,568,000 | $ 12,398,000
Charge-Offs | (170,000) | (1,423,000) | (339,000) | (1,604,000) |  |  |  |  |
Recoveries | 44,000 | 27,000 | 152,000 | 103,000 |  |  |  |  |
Provision (Credit) | 218,000 | 500,000 | 553,000 | (225,000) |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,200,000 |  | 1,200,000 |  |  | 1,200,000 |  |  |
Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | 1,204,000 |  |
Other commercial and industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 2,744,000 |  | 2,744,000 |  | 2,849,000 | 2,908,000 |  |  |
Charge-Offs | (75,000) |  | (75,000) |  |  |  |  |  |
Recoveries |  |  | 2,000 |  |  |  |  |  |
Provision (Credit) | (30,000) |  | (91,000) |  |  |  |  |  |
Other commercial and industrial | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | 2,908,000 |  |
Other commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 3,183,000 |  | 3,183,000 |  | 3,087,000 | 3,196,000 | 5,972,000 |  |
Recoveries | 4,000 |  | 11,000 |  |  |  |  |  |
Provision (Credit) | 92,000 |  | (24,000) |  |  |  |  |  |
Other commercial real estate (non-owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | (2,776,000) |  |
Residential mortgage |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,027,000 | 1,377,000 | 1,027,000 | 1,377,000 | 1,037,000 | 1,025,000 | 1,380,000 | 1,473,000 | 1,590,000
Charge-Offs | (54,000) | (9,000) | (54,000) | (32,000) |  |  |  |  |
Recoveries | 9,000 | 2,000 | 12,000 | 14,000 |  |  |  |  |
Provision (Credit) | 35,000 | (89,000) | 44,000 | (195,000) |  |  |  |  |
Residential mortgage | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | (355,000) |  |
Allocation for general risk |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 1,020,000 |  | 1,020,000 |  |  | 653,000 | 1,119,000 | 1,232,000
Provision (Credit) |  | (99,000) |  | (212,000) |  |  |  |  |
Allocation for general risk | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | (653,000) |  |
Commercial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (75,000) |  |  |  |  |  |
Commercial | Commercial. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 2,756,000 |  | 2,756,000 |  |  | 2,653,000 | 3,158,000 | 3,071,000
Charge-Offs |  |  |  | (72,000) |  |  |  |  |
Recoveries |  | 4,000 |  | 4,000 |  |  |  |  |
Provision (Credit) |  | (406,000) |  | (247,000) |  |  |  |  |
Commercial | Commercial real estate (owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,544,000 |  | 1,544,000 |  | 1,517,000 | 1,380,000 |  |  |
Recoveries | 6,000 |  | 18,000 |  |  |  |  |  |
Provision (Credit) | 21,000 |  | 146,000 |  |  |  |  |  |
Commercial | Commercial real estate (owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | 1,380,000 |  |
Commercial | Other commercial and industrial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (75,000) |  |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  | 5,432,000 |  | 5,432,000 |  |  | 5,972,000 | 5,716,000 | 6,392,000
Charge-Offs |  | (1,390,000) |  | (1,390,000) |  |  |  |  |
Recoveries |  | 13,000 |  | 39,000 |  |  |  |  |
Provision (Credit) |  | 1,093,000 |  | 391,000 |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,526,000 |  | 1,526,000 |  | 1,477,000 | 1,432,000 |  |  |
Provision (Credit) | 49,000 |  | 94,000 |  |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - retail | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | 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 | 1,175,000 |  | 1,175,000 |  | 1,145,000 | 1,226,000 |  |  |
Recoveries | 2,000 |  | 5,000 |  |  |  |  |  |
Provision (Credit) | 28,000 |  | (56,000) |  |  |  |  |  |
Commercial | Commercial real estate (non-owner occupied) - multi-family | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | 1,226,000 |  |
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) | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | (2,653,000) |  |
Consumer. |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Charge-Offs |  |  | (264,000) |  |  |  |  |  |
Consumer. | Residential mortgage |  |  |  |  |  |  |  |  |
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 | 1,114,000 | 87,000 | 1,114,000 | 87,000 | $ 1,109,000 | $ 780,000 | 85,000 | $ 102,000 | $ 113,000
Charge-Offs | (41,000) | (24,000) | (210,000) | (110,000) |  |  |  |  |
Recoveries | 23,000 | 8,000 | 104,000 | 46,000 |  |  |  |  |
Provision (Credit) | $ 23,000 | $ 1,000 | $ 440,000 | $ 38,000 |  |  |  |  |
Consumer. | Consumer | Impact of adopting ASU 2016-13 | ASU 2016-13 |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses - Loans |  |  |  |  |  |  | $ 695,000 |  |

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