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Allowance for Credit Losses - Loans - Allowance for credit losses by loan portfolio segment (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | $ 14,060,000 | $ 14,408,000 | $ 14,420,000 | $ 14,408,000 | $ 14,420,000 | $ 13,912,000 | $ 14,611,000 | $ 15,053,000
Charge-Offs | (2,800,000) | (7,000) | (204,000) | (3,088,000) | (620,000) |  |  |
Recoveries |  | 32,000 | 48,000 | 141,000 | 132,000 |  |  |
Provision (Recovery) |  | 323,000 | (35,000) | 3,443,000 | (145,000) |  |  |
Other commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 4,317,000 | 4,063,000 | 4,641,000 | 4,063,000 | 4,641,000 | 3,451,000 | 4,665,000 | 3,428,000
Charge-Offs |  |  |  | (2,762,000) |  |  |  |
Recoveries |  | 3,000 | 3,000 | 9,000 | 8,000 |  |  |
Provision (Recovery) |  | (257,000) | (27,000) | 3,365,000 | 1,205,000 |  |  |
Commercial Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Charge-Offs |  |  |  | (2,962,000) |  | (1,998,000) |  |
Commercial Portfolio Segment | Commercial real estate (owner occupied) |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 319,000 | 318,000 | 432,000 | 318,000 | 432,000 | 398,000 | 371,000 | 1,529,000
Recoveries |  | 6,000 | 6,000 | 18,000 | 18,000 |  |  |
Provision (Recovery) |  | (7,000) | 55,000 | (98,000) | (1,115,000) |  |  |
Commercial Portfolio Segment | Commercial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 3,012,000 | 3,707,000 | 2,438,000 | 3,707,000 | 2,438,000 | 2,860,000 | 2,678,000 | 3,030,000
Charge-Offs |  |  | (132,000) | (200,000) | (424,000) | (427,000) |  |
Recoveries |  | 7,000 | 12,000 | 50,000 | 33,000 |  |  |
Provision (Recovery) |  | 688,000 | (120,000) | 997,000 | (201,000) |  |  |
Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - retail |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 3,516,000 | 3,493,000 | 3,451,000 | 3,493,000 | 3,451,000 | 3,695,000 | 3,519,000 | 3,488,000
Provision (Recovery) |  | (23,000) | (68,000) | (202,000) | (37,000) |  |  |
Commercial Portfolio Segment | Commercial real estate (non-owner occupied) - multi-family |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 1,446,000 | 1,378,000 | 1,423,000 | 1,378,000 | 1,423,000 | 1,478,000 | 1,370,000 | 1,430,000
Recoveries |  |  |  |  | 3,000 |  |  |
Provision (Recovery) |  | (68,000) | 53,000 | (100,000) | (10,000) |  |  |
Commercial Portfolio Segment | Other commercial real estate (non-owner occupied) |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Charge-Offs |  |  |  | (2,762,000) |  | (1,571,000) |  |
Residential mortgages |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | 310,000 | 303,000 | 852,000 | 303,000 | 852,000 | 839,000 | 852,000 | 1,021,000
Recoveries |  | 1,000 | 2,000 | 3,000 | 5,000 |  |  |
Provision (Recovery) |  | (8,000) | (2,000) | (539,000) | (174,000) |  |  |
Consumer |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit losses - Loans | $ 1,140,000 | 1,146,000 | 1,183,000 | 1,146,000 | 1,183,000 | 1,191,000 | $ 1,156,000 | $ 1,127,000
Charge-Offs |  | (7,000) | (72,000) | (126,000) | (196,000) | $ (207,000) |  |
Recoveries |  | 15,000 | 25,000 | 61,000 | 65,000 |  |  |
Provision (Recovery) |  | $ (2,000) | $ 74,000 | $ 20,000 | $ 187,000 |  |  |

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