Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Deferred Tax Assets, Gross [Abstract] | ||
| Allowance for Loan Losses | $ 6,453 | $ 6,113 |
| Pension and Deferred Compensation Plans | 3,973 | 3,885 |
| Pension Liability Included in Accumulated Other Comprehensive Income | 5,550 | 6,263 |
| Other | 557 | 614 |
| Total Gross Deferred Tax Assets | 16,533 | 16,875 |
| Valuation Allowance for Deferred Tax Assets | 0 | 0 |
| Total Gross Deferred Tax Assets, Net of Valuation Allowance | 16,533 | 16,875 |
| Deferred Tax Liabilities, Gross [Abstract] | ||
| Pension Plans | 8,680 | 7,604 |
| Depreciation | 1,383 | 1,222 |
| Deferred Income | 4,167 | 3,927 |
| Net Unrealized Gains on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income | 405 | 1,638 |
| Goodwill | 5,316 | 5,242 |
| Total Gross Deferred Tax Liabilites | $ 19,951 | $ 19,633 |