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Loans and Related Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 contract | Sep. 30, 2018 USD ($) contract | Sep. 30, 2017 contract | Dec. 31, 2017 USD ($)
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 |  |
Commerical amount benchmark internal impairment review minimum relationship amount |  | 750,000 |  |
Nonaccrual loans |  | 4,824,000 |  | $ 7,118,000
Decrease in non-accrual balance due to charge-offs |  | 800,000 |  |
Loan recovery |  | 2,500,000 |  |
Loans in process of foreclosure |  | $ 400,000 |  |
Accruing loans past due 30 days or greater as percent of loan portfolio |  | 0.36% |  | 0.63%
Partial Charge Off [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans |  | $ 800,000 |  | $ 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 | 1 |  | 3 |
One Large Commercial Real Estate Relationship [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Additional nonaccrual credit added |  | $ 1,900,000 |  |
Commercial real estate- non owner-occupied [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans |  | 609,000 |  | 3,248,000
Commercial and industrial [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Nonaccrual loans |  | $ 0 |  | $ 378,000

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