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Loans and Allowance for Loan Losses - Outstanding and Aging Analysis (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 1,798,690,000 | $ 1,763,864,000
Unpaid balances on purchase credit impaired (PCI) loans | 0 | 0
Purchased Credit-impaired (PCI) loans accreting interest | 2,100,000 | 2,100,000
Loans past due more than 90 days still accruing | 0 | 0
Deferred loan fees | 980,000 | 635,000
Unaccreted purchase discounts on non-PCI loans | 669,000 | 708,000
Commercial loans | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 260,828,000 | 230,739,000
Commercial real estate loans | Commercial real estate, owner-occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 310,486,000 | 313,277,000
Commercial real estate loans | Commercial real estate, investor |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 896,066,000 | 873,410,000
Commercial real estate loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 50,254,000 | 76,423,000
Residential loans | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 121,814,000 | 124,696,000
Residential loans | Other residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 130,781,000 | 117,847,000
Consumer loans | Installment and other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 28,461,000 | 27,472,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 780,000 | 1,121,000
Current | 1,797,910,000 | 1,762,743,000
Total loans | 1,798,690,000 | 1,763,864,000
Non-accrual | 422,000 | 697,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 593,000 | 1,121,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 94,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 93,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial loans | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 20,000 | 5,000
Current | 260,808,000 | 230,734,000
Total loans | 260,828,000 | 230,739,000
Non-accrual | 195,000 | 319,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial loans | Commercial and industrial | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 5,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial loans | Commercial and industrial | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial loans | Commercial and industrial | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 20,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, owner-occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Current | 310,486,000 | 313,277,000
Total loans | 310,486,000 | 313,277,000
Non-accrual | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, owner-occupied | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, investor |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 1,004,000
Current | 896,066,000 | 872,406,000
Total loans | 896,066,000 | 873,410,000
Non-accrual | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, investor | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 1,004,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, investor | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Commercial real estate, investor | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Current | 50,254,000 | 76,423,000
Total loans | 50,254,000 | 76,423,000
Non-accrual | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Construction | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Construction | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial real estate loans | Construction | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 607,000 | 0
Current | 121,207,000 | 124,696,000
Total loans | 121,814,000 | 124,696,000
Non-accrual | 167,000 | 313,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Home equity | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 440,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Home equity | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 94,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Home equity | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 73,000 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Other residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Current | 130,781,000 | 117,847,000
Total loans | 130,781,000 | 117,847,000
Non-accrual | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Other residential | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Other residential | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential loans | Other residential | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Installment and other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 153,000 | 112,000
Current | 28,308,000 | 27,360,000
Total loans | 28,461,000 | 27,472,000
Non-accrual | 60,000 | 65,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Installment and other consumer | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 153,000 | 112,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Installment and other consumer | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Installment and other consumer | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | $ 0 | $ 0

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