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Stock Based Compensation (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Stock-Based Compensation [Abstract] |  |  |
Options, Outstanding, beginning of period | 206,463 |  |
Options, Granted | 0 |  |
Options, Exercised | (11,931) |  |
Options, Forfeited | (9,583) |  |
Options, Outstanding, end of period | 184,949 |  | 206,463
Options, Exercisable, end of period | 172,949 |  |
Weighted Average Exercise Price Per Share, Outstanding, beginning of period | $ 26.74 |  |
Weighted Average Exercise Price Per Share, Exercised | 26.00 |  |
Weighted Average Exercise Price Per Share, Forfeited | 27.02 |  |
Weighted Average Exercise Price Per Share, Outstanding, end of period | 26.77 |  | $ 26.74
Weighted Average Exercise Price Per Share, Exercisable, end of period | $ 26.61 |  |
Weighted Average Remaining Contractual Term, Outstanding | 5 years |  | 5 years 8 months 12 days
Weighted Average Remaining Contractual Term, Exercised During Period | 4 years 4 months 24 days |  |
Weighted Average Remaining Contractual Term, Forfeited During Period | 4 years 3 months 18 days |  |
Weighted Average Remaining Contractual Term, Exercisable at End of Period | 4 years 8 months 12 days |  |
Aggregate Intrinsic Value, Outstanding, beginning of period | $ 478 |  |
Aggregate Intrinsic Value, Granted in Period | 0 |  |
Aggregate Intrinsic Value, Exercised in Period | 0 |  |
Aggregate Intrinsic Value, Forfeited in Period | 0 |  |
Aggregate Intrinsic Value, Outstanding, end of period | 413 |  | $ 478
Aggregate Intrinsic Value, Exercisable at end of period | 413 |  |
Unrecognized compensation cost related to non-vested options granted | 16 |  |
Compensation expense related to stock options | $ 49 | $ 120 |
Share Price | $ 29.00 | $ 28.60 | $ 29.05

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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