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Loans and Allowance for Loan Credit Losses - Schedule of Amortized Costs by Segment of Loans and Credit Risk Profile of Loan Portfolio (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, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Total | $ 300,032 |  | $ 300,032 |  | $ 304,144
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |
Gross charge-offs, Loans | 0 | $ 0 | 0 | $ 0 |
Commercial real estate |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 849
Year before current fiscal year | 1,338 |  | 1,338 |  | 5,521
Two years before current fiscal year | 5,458 |  | 5,458 |  | 9,327
Three years before current year | 8,950 |  | 8,950 |  | 3,713
Four years before current fiscal year | 3,500 |  | 3,500 |  | 8,015
Prior | 28,451 |  | 28,451 |  | 23,818
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 3,690 |  | 3,690 |  | 8,895
Total | 51,387 |  | 51,387 |  | 60,138
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |
Gross charge-offs, current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, three years before current year |  |  | 0 |  | 0
Gross charge-offs, four years before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, prior |  |  | 0 |  | 0
Gross charge-offs, Revolving Loans |  |  | 0 |  | 0
Gross charge-offs, Revolving to Term Loans |  |  | 0 |  | 0
Gross charge-offs, Loans | 0 | 0 | 0 | 0 | 0
Commercial real estate | Pass |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 849
Year before current fiscal year | 1,338 |  | 1,338 |  | 5,521
Two years before current fiscal year | 5,458 |  | 5,458 |  | 9,327
Three years before current year | 8,950 |  | 8,950 |  | 3,713
Four years before current fiscal year | 3,500 |  | 3,500 |  | 8,015
Prior | 26,581 |  | 26,581 |  | 21,875
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 3,690 |  | 3,690 |  | 8,895
Total | 49,517 |  | 49,517 |  | 58,195
Commercial real estate | Special Mention |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 1,526 |  | 1,526 |  | 1,570
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 1,526 |  | 1,526 |  | 1,570
Commercial real estate | Substandard |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 344 |  | 344 |  | 373
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 344 |  | 344 |  | 373
Commercial real estate | Doubtful |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Commercial real estate | Loss |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Commercial |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 424 |  | 424 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 573
Two years before current fiscal year | 557 |  | 557 |  | 14
Three years before current year | 11 |  | 11 |  | 42
Four years before current fiscal year | 3 |  | 3 |  | 1,352
Prior | 1,389 |  | 1,389 |  | 309
Revolving Loans | 8,760 |  | 8,760 |  | 10,148
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 11,144 |  | 11,144 |  | 12,438
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |
Gross charge-offs, current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, three years before current year |  |  | 0 |  | 0
Gross charge-offs, four years before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, prior |  |  | 0 |  | 0
Gross charge-offs, Revolving Loans |  |  | 0 |  | 0
Gross charge-offs, Revolving to Term Loans |  |  | 0 |  | 0
Gross charge-offs, Loans | 0 | 0 | 0 | 0 | 0
Commercial | Pass |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 424 |  | 424 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 573
Two years before current fiscal year | 557 |  | 557 |  | 14
Three years before current year | 11 |  | 11 |  | 42
Four years before current fiscal year | 3 |  | 3 |  | 1,352
Prior | 1,389 |  | 1,389 |  | 309
Revolving Loans | 8,760 |  | 8,760 |  | 10,148
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 11,144 |  | 11,144 |  | 12,438
Commercial | Special Mention |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Commercial | Substandard |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Commercial | Doubtful |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Commercial | Loss |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Residential real estate closed-end |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 18,574 |  | 18,574 |  | 20,230
Year before current fiscal year | 17,911 |  | 17,911 |  | 45,920
Two years before current fiscal year | 47,541 |  | 47,541 |  | 45,528
Three years before current year | 43,650 |  | 43,650 |  | 25,150
Four years before current fiscal year | 23,600 |  | 23,600 |  | 18,035
Prior | 66,853 |  | 66,853 |  | 55,495
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 218,129 |  | 218,129 |  | 210,358
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |
Gross charge-offs, current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, three years before current year |  |  | 0 |  | 0
Gross charge-offs, four years before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, prior |  |  | 0 |  | 0
Gross charge-offs, Revolving Loans |  |  | 0 |  | 0
Gross charge-offs, Revolving to Term Loans |  |  | 0 |  | 0
Gross charge-offs, Loans | 0 | 0 | 0 | 0 | 0
Residential real estate closed-end | Pass |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 18,574 |  | 18,574 |  | 20,230
Year before current fiscal year | 17,911 |  | 17,911 |  | 45,920
Two years before current fiscal year | 47,541 |  | 47,541 |  | 45,528
Three years before current year | 43,650 |  | 43,650 |  | 25,150
Four years before current fiscal year | 23,600 |  | 23,600 |  | 18,035
Prior | 66,616 |  | 66,616 |  | 55,253
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 217,892 |  | 217,892 |  | 210,116
Residential real estate closed-end | Special Mention |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Residential real estate closed-end | Substandard |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 237 |  | 237 |  | 242
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 237 |  | 237 |  | 242
Residential real estate closed-end | Doubtful |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Residential real estate closed-end | Loss |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Other consumer loans |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 32
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 17,869 |  | 17,869 |  | 17,703
Revolving to Term Loans | 1,503 |  | 1,503 |  | 3,475
Total | 19,372 |  | 19,372 |  | 21,210
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |  |  |
Gross charge-offs, current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, year before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, three years before current year |  |  | 0 |  | 0
Gross charge-offs, four years before current fiscal year |  |  | 0 |  | 0
Gross charge-offs, prior |  |  | 0 |  | 0
Gross charge-offs, Revolving Loans |  |  | 0 |  | 0
Gross charge-offs, Revolving to Term Loans |  |  | 0 |  | 0
Gross charge-offs, Loans | 0 | $ 0 | 0 | $ 0 | 0
Other consumer loans | Pass |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 32
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 17,869 |  | 17,869 |  | 17,703
Revolving to Term Loans | 1,503 |  | 1,503 |  | 3,475
Total | 19,372 |  | 19,372 |  | 21,210
Other consumer loans | Special Mention |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Other consumer loans | Substandard |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Other consumer loans | Doubtful |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | 0 |  | 0 |  | 0
Other consumer loans | Loss |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |  |  |
Current fiscal year | 0 |  | 0 |  | 0
Year before current fiscal year | 0 |  | 0 |  | 0
Two years before current fiscal year | 0 |  | 0 |  | 0
Three years before current year | 0 |  | 0 |  | 0
Four years before current fiscal year | 0 |  | 0 |  | 0
Prior | 0 |  | 0 |  | 0
Revolving Loans | 0 |  | 0 |  | 0
Revolving to Term Loans | 0 |  | 0 |  | 0
Total | $ 0 |  | $ 0 |  | $ 0

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