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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Allowance for Loan Losses | $ 6,609 | $ 6,453
Pension and Deferred Compensation Plans | 3,961 | 3,973
Pension Liability Included in Accumulated Other Comprehensive Income | 4,023 | 5,550
Other | 502 | 557
Deferred Tax Assets, Unrealized Losses on Trading Securities | 239 | 0
Total Gross Deferred Tax Assets | 15,334 | 16,533
Valuation Allowance for Deferred Tax Assets | 0 | 0
Total Gross Deferred Tax Assets, Net of Valuation Allowance | 15,334 | 16,533
Deferred Tax Liabilities, Gross [Abstract] |  |
Pension Plans | 8,399 | 8,680
Depreciation | 1,430 | 1,383
Deferred Income | 4,199 | 4,167
Net Unrealized Gains on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income | 0 | 405
Goodwill | 5,324 | 5,316
Total Gross Deferred Tax Liabilites | $ 19,352 | $ 19,951

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