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Loans and Related Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) contract | Sep. 30, 2016 USD ($) contract | Sep. 30, 2015 USD ($) contract | Dec. 31, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 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 |  | 500,000 |  |  |  |  |
Commerical amount benchmark internal impairment review minimum relationship amount |  | 750,000 |  |  |  |  |
Commercial amount benchmark to require external appraisal |  | 500,000 |  |  |  |  |
Nonaccrual loans | $ 18,144,000 | 18,144,000 |  | $ 15,498,000 |  |  |
Reduction of the ALL resulting from change in evaluation method of loans | 468 | 3,341 | $ 5,744 |  |  |  |
Loans in process of foreclosure | 1,200,000 | $ 1,200,000 |  | $ 1,800,000 |  |  |
Accruing loans past due 30 days or greater as percent of loan portfolio |  | 0.69% |  | 0.76% |  |  |
Total allowance for loan losses | 12,044,000 | $ 12,044,000 | $ 12,211,000 | $ 11,922,000 | $ 12,678,000 | $ 11,809,000 | $ 12,065,000
Partial Charge Off [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Nonaccrual loans | $ 5,200,000 | $ 5,200,000 |  | 4,100,000 |  |  |
New TDR [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract | 1 | 4 | 8 |  |  |  |
Pre Existing TDR Loans Remodified After Maturity [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Financing receivable, modifications, number of contracts | contract |  | 3 | 10 |  |  |  |
Unallocated [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Total allowance for loan losses | $ 500,000 | $ 500,000 |  |  |  |  |
Residential Mortgage [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Nonaccrual loans |  |  |  |  |  | $ 70,000 |
Commercial real estate- non owner-occupied [Member] |  |  |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |  |  |
Nonaccrual loans | $ 9,687,000 | $ 9,687,000 |  | $ 1,308,000 |  |  |

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