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Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due $ 2,331,000 $ 502,000
Current 1,676,682,000 1,486,114,000
Total loans 1,679,013,000 1,486,616,000
Non-accrual loans $ 406,000 145,000
Number of purchase credit impaired (PCI) loans with unpaid balances | loan 3  
Unpaid balances on purchase credit impaired (PCI) loans $ 131,000  
Purchased Credit Impaired (PCI) loans no longer accreting interest 0 0
Purchased Credit-impaired (PCI) loans accreting interest 2,100,000 2,900,000
Deferred loan fees 818,000 883,000
Unaccreted purchase discounts on non-PCI loans 1,200,000 1,800,000
30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 684,000 362,000
60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 1,340,000 49,000
90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 307,000 91,000
Commercial | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 1,340,000 283,000
Current 234,495,000 218,332,000
Total loans 235,835,000 218,615,000
Non-accrual loans 0 0
Commercial | Commercial and industrial | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 283,000
Commercial | Commercial and industrial | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 1,340,000 0
Commercial | Commercial and industrial | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, owner-occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Current 300,963,000 247,713,000
Total loans 300,963,000 247,713,000
Non-accrual loans 0 0
Commercial real estate | Commercial real estate, owner-occupied | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, owner-occupied | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, owner-occupied | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, investor    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Current 822,984,000 724,228,000
Total loans 822,984,000 724,228,000
Non-accrual loans 0 0
Commercial real estate | Commercial real estate, investor | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, investor | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Commercial real estate, investor | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Current 63,828,000 74,809,000
Total loans 63,828,000 74,809,000
Non-accrual loans 0 0
Commercial real estate | Construction | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Construction | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Commercial real estate | Construction | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Residential loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 406,000 168,000
Current 132,061,000 117,039,000
Total loans 132,467,000 117,207,000
Non-accrual loans 406,000 91,000
Residential loans | Home equity | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 99,000 77,000
Residential loans | Home equity | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Residential loans | Home equity | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 307,000 91,000
Residential loans | Other residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 255,000 0
Current 95,271,000 78,549,000
Total loans 95,526,000 78,549,000
Non-accrual loans 0 0
Residential loans | Other residential | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 255,000 0
Residential loans | Other residential | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Residential loans | Other residential | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 0
Consumer loans | Installment and other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 330,000 51,000
Current 27,080,000 25,444,000
Total loans 27,410,000 25,495,000
Non-accrual loans 0 54,000
Consumer loans | Installment and other consumer | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 330,000 2,000
Consumer loans | Installment and other consumer | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due 0 49,000
Consumer loans | Installment and other consumer | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total past due $ 0 $ 0