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Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due $ 413,000 $ 502,000
Current 1,524,034,000 1,486,114,000
Total loans 1,524,447,000 1,486,616,000
Non-accrual 1,316,000 145,000
Purchased Credit-impaired (PCI) loans accreting interest 2,300,000 2,900,000
Loans past due more than 90 days still accruing 0 0
Deferred loan fees 798,000 883,000
Unaccreted purchase discounts on non-PCI loans 1,300,000 1,800,000
30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 105,000 362,000
60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 308,000 49,000
90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 91,000
Commercial loans | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 283,000
Current 218,681,000 218,332,000
Total loans 218,681,000 218,615,000
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 0 283,000
Commercial loans | Commercial and industrial | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
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 264,732,000 247,713,000
Total loans 264,732,000 247,713,000
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 721,576,000 724,228,000
Total loans 721,576,000 724,228,000
Non-accrual 1,024,000 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 76,179,000 74,809,000
Total loans 76,179,000 74,809,000
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 407,000 168,000
Current 120,959,000 117,039,000
Total loans 121,366,000 117,207,000
Non-accrual 292,000 91,000
Residential loans | Home equity | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 100,000 77,000
Residential loans | Home equity | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 307,000 0
Residential loans | Home equity | 90 days or more past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 91,000
Residential loans | Other residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 0 0
Current 96,937,000 78,549,000
Total loans 96,937,000 78,549,000
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 0
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 6,000 51,000
Current 24,970,000 25,444,000
Total loans 24,976,000 25,495,000
Non-accrual 0 54,000
Consumer loans | Installment and other consumer | 30-59 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 5,000 2,000
Consumer loans | Installment and other consumer | 60-89 days past due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans past due 1,000 49,000
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