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Loans and Allowance for Credit Losses on Loans - Loans Outstanding and Aging Analysis (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | $ 2,073,720,000 | $ 2,092,546,000 |
Non-accrual loans | 7,992,000 | 2,432,000 |
Non-accrual loans with no allowance | $ 3,091,000 | $ 2,432,000 |
Number of loans past due more than 90 days still accruing | loan | 0 | 0 |
Nonaccrual loans earning interest on cash basis | $ 0 | $ 0 |
Nonaccrual interest income | 0 | 0 | $ 0
Accrued interest writeoff | 206,000 | 48,000 | $ 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,073,720,000 | 2,092,546,000 |
Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 7,664,000 | 1,342,000 |
30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 3,930,000 | 420,000 |
60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,274,000 | 244,000 |
90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,460,000 | 678,000 |
Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,066,056,000 | 2,091,204,000 |
Commercial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 153,750,000 | 173,547,000 |
Non-accrual loans | 4,008,000 | 0 |
Non-accrual loans with no allowance | 1,311,000 | 0 |
Commercial | Commercial and industrial | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 153,750,000 | 173,547,000 |
Commercial | Commercial and industrial | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 4,371,000 | 267,000 |
Commercial | Commercial and industrial | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,991,000 | 3,000 |
Commercial | Commercial and industrial | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 69,000 | 0 |
Commercial | Commercial and industrial | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,311,000 | 264,000 |
Commercial | Commercial and industrial | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 149,379,000 | 173,280,000 |
Commercial real estate | Commercial owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 333,181,000 | 354,877,000 |
Non-accrual loans | 434,000 | 1,563,000 |
Non-accrual loans with no allowance | 434,000 | 1,563,000 |
Commercial real estate | Commercial owner-occupied | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 333,181,000 | 354,877,000 |
Commercial real estate | Commercial owner-occupied | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 767,000 | 0 |
Commercial real estate | Commercial owner-occupied | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 618,000 | 0 |
Commercial real estate | Commercial owner-occupied | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Commercial owner-occupied | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 149,000 | 0 |
Commercial real estate | Commercial owner-occupied | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 332,414,000 | 354,877,000 |
Commercial real estate | Commercial real estate, non-owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,219,385,000 | 1,191,889,000 |
Non-accrual loans | 3,081,000 | 0 |
Non-accrual loans with no allowance | 877,000 | 0 |
Commercial real estate | Commercial real estate, non-owner occupied | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,219,385,000 | 1,191,889,000 |
Commercial real estate | Commercial real estate, non-owner occupied | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,204,000 | 0 |
Commercial real estate | Commercial real estate, non-owner occupied | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Commercial real estate, non-owner occupied | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 2,204,000 | 0 |
Commercial real estate | Commercial real estate, non-owner occupied | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Commercial real estate, non-owner occupied | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,217,181,000 | 1,191,889,000 |
Commercial real estate | Construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 99,164,000 | 114,373,000 |
Non-accrual loans | 0 | 0 |
Non-accrual loans with no allowance | 0 | 0 |
Commercial real estate | Construction | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 99,164,000 | 114,373,000 |
Commercial real estate | Construction | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Construction | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Construction | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Construction | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Commercial real estate | Construction | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 99,164,000 | 114,373,000 |
Residential loans | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 82,087,000 | 88,748,000 |
Non-accrual loans | 469,000 | 778,000 |
Non-accrual loans with no allowance | 469,000 | 778,000 |
Residential loans | Home equity | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 82,087,000 | 88,748,000 |
Residential loans | Home equity | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 43,000 | 977,000 |
Residential loans | Home equity | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 43,000 | 319,000 |
Residential loans | Home equity | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 244,000 |
Residential loans | Home equity | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 414,000 |
Residential loans | Home equity | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 82,044,000 | 87,771,000 |
Residential loans | Other residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 118,508,000 | 112,123,000 |
Non-accrual loans | 0 | 0 |
Non-accrual loans with no allowance | 0 | 0 |
Residential loans | Other residential | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 118,508,000 | 112,123,000 |
Residential loans | Other residential | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 83,000 | 93,000 |
Residential loans | Other residential | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 83,000 | 93,000 |
Residential loans | Other residential | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Residential loans | Other residential | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Residential loans | Other residential | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 118,425,000 | 112,030,000 |
Consumer loans | Installment and other consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 67,645,000 | 56,989,000 |
Non-accrual loans | 0 | 91,000 |
Non-accrual loans with no allowance | 0 | 91,000 |
Consumer loans | Installment and other consumer loans | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 67,645,000 | 56,989,000 |
Consumer loans | Installment and other consumer loans | Total past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 196,000 | 5,000 |
Consumer loans | Installment and other consumer loans | 30-59 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 195,000 | 5,000 |
Consumer loans | Installment and other consumer loans | 60-89 days past due | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 1,000 | 0 |
Consumer loans | Installment and other consumer loans | 90 days or more past due 1 | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | 0 | 0 |
Consumer loans | Installment and other consumer loans | Current | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans, at amortized cost | $ 67,449,000 | $ 56,984,000 |

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