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