Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]
Allowance for Loan Losses	$ 5,131	$ 4,730
Pension and Deferred Compensation Plans	2,764	2,595
Pension Liability Included in Accumulated Other Comprehensive Income	3,450	2,475
Other	342	357
Deferred Tax Assets, Unrealized Losses on Trading Securities	1,259	426
Total Gross Deferred Tax Assets	12,946	10,583
Valuation Allowance for Deferred Tax Assets	0	0
Total Gross Deferred Tax Assets, Net of Valuation Allowance	12,946	10,583
Deferred Tax Liabilities, Gross [Abstract]
Pension Plans	5,502	5,487
Depreciation	1,149	955
Deferred Income	3,003	2,779
Net Unrealized Gains on Equity Securities	166	0
Goodwill	3,546	3,566
Total Gross Deferred Tax Liabilities	$ 13,366	$ 12,787