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Loans and Allowance for Loan Losses - Loans Outstanding and Aging Analysis (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | $ 629,000 | $ 2,224,000
Current | 1,467,034,000 | 1,449,004,000
Total loans | 1,467,663,000 | 1,451,228,000
Purchased Credit Impaired (PCI) loans no longer accreting interest |  | 1,000
Purchased Credit-impaired (PCI) loans accreting interest | 2,900,000 | 3,700,000
Loans past due more than 90 days still accruing | 0 | 0
Deferred loan fees | 869,000 | 768,000
Unaccreted purchase discounts on non-PCI loans | 1,900,000 | 3,200,000
Non-accrual | 540,000 | 2,179,000
30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 310,000 | 1,382,000
60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 722,000
90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 319,000 | 120,000
Commercial loans | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 46,000 | 57,000
Current | 221,161,000 | 219,395,000
Total loans | 221,207,000 | 219,452,000
Non-accrual | 44,000 | 21,000
Commercial loans | Commercial and industrial | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 2,000 | 36,000
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 | 44,000 | 21,000
Commercial real estate loans | Commercial real estate, owner-occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 311,000 | 0
Current | 237,227,000 | 242,309,000
Total loans | 237,538,000 | 242,309,000
Non-accrual | 176,000 | 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 | 135,000 | 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 | 176,000 | 0
Commercial real estate loans | Commercial real estate, investor |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 1,096,000
Current | 715,051,000 | 714,783,000
Total loans | 715,051,000 | 715,879,000
Non-accrual | 0 | 1,903,000
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 | 1,096,000
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 | 1,000
Current | 80,491,000 | 65,494,000
Total loans | 80,491,000 | 65,495,000
Non-accrual | 0 | 1,000
Commercial real estate loans | Construction | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 1,000
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 | 189,000 | 732,000
Current | 111,022,000 | 111,568,000
Total loans | 111,211,000 | 112,300,000
Non-accrual | 260,000 | 171,000
Residential loans | Home equity | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 90,000 | 0
Residential loans | Home equity | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 633,000
Residential loans | Home equity | 90 days or more past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 99,000 | 99,000
Residential loans | Other residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 0
Current | 77,769,000 | 73,154,000
Total loans | 77,769,000 | 73,154,000
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 | 83,000 | 338,000
Current | 24,313,000 | 22,301,000
Total loans | 24,396,000 | 22,639,000
Non-accrual | 60,000 | 83,000
Consumer loans | Installment and other consumer | 30-59 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 83,000 | 249,000
Consumer loans | Installment and other consumer | 60-89 days past due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans past due | 0 | 89,000
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

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