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Loans and Allowance for Loan Losses - Outstanding and Aging Analysis (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due $ 389,000 $ 2,331,000
Current 1,671,351,000 1,676,682,000
Total loans 1,671,740,000 1,679,013,000
Non-accrual $ 392,000 $ 406,000
Number of purchase credit impaired (PCI) loans with unpaid balances | loan 1 3
Unpaid balances on purchase credit impaired (PCI) loans $ 11,000 $ 131,000
Purchased Credit Impaired (PCI) loans no longer accreting interest 0 0
Purchased Credit-impaired (PCI) loans accreting interest 2,100,000  
Loans past due more than 90 days still accruing 0 0
Deferred loan fees 928,000 818,000
Unaccreted purchase discounts on non-PCI loans 1,100,000 1,200,000
30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 385,000 684,000
60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 4,000 1,340,000
90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 307,000
Commercial loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 4,000 1,340,000
Current 231,676,000 234,495,000
Total loans 231,680,000 235,835,000
Non-accrual 0 0
Commercial loans | Commercial and industrial | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Commercial loans | Commercial and industrial | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 4,000 1,340,000
Commercial loans | Commercial and industrial | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Commercial real estate loans | Commercial real estate, owner-occupied    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Current 300,377,000 300,963,000
Total loans 300,377,000 300,963,000
Non-accrual 0 0
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
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
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
Commercial real estate loans | Commercial real estate, investor    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Current 828,945,000 822,984,000
Total loans 828,945,000 822,984,000
Non-accrual 0 0
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 0
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
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
Commercial real estate loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Current 64,978,000 63,828,000
Total loans 64,978,000 63,828,000
Non-accrual 0 0
Commercial real estate loans | Construction | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Commercial real estate loans | Construction | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Commercial real estate loans | Construction | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Residential loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 385,000 406,000
Current 124,314,000 132,061,000
Total loans 124,699,000 132,467,000
Non-accrual 392,000 406,000
Residential loans | Home equity | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 385,000 99,000
Residential loans | Home equity | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Residential loans | Home equity | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 307,000
Residential loans | Other residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 255,000
Current 95,621,000 95,271,000
Total loans 95,621,000 95,526,000
Non-accrual 0 0
Residential loans | Other residential | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 255,000
Residential loans | Other residential | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Residential loans | Other residential | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Consumer loans | Installment and other consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 330,000
Current 25,440,000 27,080,000
Total loans 25,440,000 27,410,000
Non-accrual 0 0
Consumer loans | Installment and other consumer | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 330,000
Consumer loans | Installment and other consumer | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
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