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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