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Loans and Allowance for Loan Losses - Outstanding and Aging Analysis (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 1,764,879,000 $ 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 781,000 635,000
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 234,832,000 230,739,000
Commercial real estate loans | Commercial real estate, owner-occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 306,327,000 313,277,000
Commercial real estate loans | Commercial real estate, investor    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 878,969,000 873,410,000
Commercial real estate loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 63,563,000 76,423,000
Residential loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 125,968,000 124,696,000
Residential loans | Other residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 124,120,000 117,847,000
Consumer loans | Installment and other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 31,100,000 27,472,000
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 520,000 1,121,000
Current 1,764,359,000 1,762,743,000
Total loans 1,764,879,000 1,763,864,000
Non-accrual 574,000 697,000
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 416,000 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 20,000 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 84,000 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 0 5,000
Current 234,832,000 230,734,000
Total loans 234,832,000 230,739,000
Non-accrual 354,000 319,000
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 0 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 306,327,000 313,277,000
Total loans 306,327,000 313,277,000
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 878,969,000 872,406,000
Total loans 878,969,000 873,410,000
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 63,563,000 76,423,000
Total loans 63,563,000 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 356,000 0
Current 125,612,000 124,696,000
Total loans 125,968,000 124,696,000
Non-accrual 157,000 313,000
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 272,000 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 0 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 84,000 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 124,120,000 117,847,000
Total loans 124,120,000 117,847,000
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 164,000 112,000
Current 30,936,000 27,360,000
Total loans 31,100,000 27,472,000
Non-accrual 63,000 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 144,000 112,000
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 20,000 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