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Allowance for Credit Losses - Loans - Allowance for credit losses by loan portfolio segment (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | $ 14,639,000 | $ 12,132,000 | $ 15,053,000 | $ 10,743,000
Charge-Offs | (164,000) | (139,000) |  |
Recoveries | 43,000 | 23,000 |  |
Provision (Recovery) | (293,000) | 301,000 |  |
ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | 1,200,000 |  |  |
Adoption of ASC 326 | 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 | 2,667,000 | 2,873,000 | 3,030,000 |
Charge-Offs | (103,000) |  |  |
Recoveries | 12,000 | 1,000 |  |
Provision (Recovery) | (272,000) | (36,000) |  |
Other commercial and industrial | Adoption of ASC 326 | ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  | 2,908,000 |  |
Commercial real estate (non-owner occupied) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  | 3,197,000 |  | 5,972,000
Recoveries |  | 4,000 |  |
Provision (Recovery) |  | (3,000) |  |
Commercial real estate (non-owner occupied) | Adoption of ASC 326 | ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  | (2,776,000) |  |
Other commercial real estate (non-owner occupied) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | 4,616,000 |  | 3,428,000 |
Recoveries | 2,000 |  |  |
Provision (Recovery) | 1,186,000 |  |  |
Residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | 847,000 | 1,032,000 | 1,021,000 | 1,380,000
Recoveries | 1,000 | 2,000 |  |
Provision (Recovery) | (175,000) | 5,000 |  |
Residential mortgage | Adoption of ASC 326 | 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 |  |  |  | 653,000
Allocation for general risk | Adoption of ASC 326 | 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 | (103,000) |  | (3,312,000) |
Commercial | Commercial real estate (owner occupied) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | 416,000 | 1,320,000 | 1,529,000 |
Recoveries | 6,000 | 6,000 |  |
Provision (Recovery) | (1,119,000) | (66,000) |  |
Commercial | Commercial real estate (owner occupied) | Adoption of ASC 326 | 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 | (103,000) |  | (480,000) |
Commercial | Commercial real estate (non-owner occupied) |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  |  | 3,488,000 |
Commercial | Commercial real estate (non-owner occupied) - retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans | 3,606,000 | 1,486,000 | 3,488,000 |
Charge-Offs |  |  | (2,028,000) |
Provision (Recovery) | 118,000 | 54,000 |  |
Commercial | Commercial real estate (non-owner occupied) - retail | Adoption of ASC 326 | 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 | 1,358,000 | 1,146,000 | 1,430,000 |
Recoveries | 2,000 | 1,000 |  |
Provision (Recovery) | (74,000) | (81,000) |  |
Commercial | Commercial real estate (non-owner occupied) - multi-family | Adoption of ASC 326 | ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  | 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) | Adoption of ASC 326 | 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 | (61,000) |  | (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 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 | 1,129,000 | 1,078,000 | 1,127,000 | $ 85,000
Charge-Offs | (61,000) | (139,000) | $ (275,000) |
Recoveries | 20,000 | 9,000 |  |
Provision (Recovery) | $ 43,000 | 428,000 |  |
Consumer | Consumer | Adoption of ASC 326 | ASU 2016-13 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses - Loans |  | $ 695,000 |  |

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