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Loans and Related Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 contract | Jun. 30, 2018 USD ($) contract | Jun. 30, 2017 contract | Dec. 31, 2017 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Commercial amount benchmark minimum for internal annual review |  |  | $ 500,000 |  |
Commercial amount benchmark minimum for annual review by independent reviewer |  |  | 1,000,000 |  |
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer |  |  | 500,000 |  |
Nonaccrual loans | $ 5,016,000 |  | 5,016,000 |  | $ 7,118,000
Decrease in non-accrual balance due to charge-offs |  |  | 800,000 |  |
Loan recovery |  |  | 2,500,000 |  |
Loans in process of foreclosure | $ 100,000 |  | $ 100,000 |  | $ 400,000
Accruing loans past due 30 days or greater as percent of loan portfolio | 0.31% |  | 0.31% |  | 0.63%
Partial Charge Off [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans | $ 900,000 |  | $ 900,000 |  | $ 2,100,000
New TDR [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 0 | 0 | 0 |
Pre Existing TDR Loans Remodified After Maturity [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing receivable, modifications, number of contracts | contract | 2 |  | 2 | 2 |
One Large Commercial Real Estate Relationship [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Additional nonaccrual credit added | $ 1,900,000 |  | $ 1,900,000 |  |
Commercial real estate- non owner-occupied [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans | 689,000 |  | 689,000 |  | 3,248,000
Commercial and industrial [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Nonaccrual loans | $ 16,000 |  | $ 16,000 |  | $ 378,000

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