Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]
Allowance for Loan Losses	$ 5,383	$ 5,131
Lease liabilities	2,787
Pension and Deferred Compensation Plans	2,923	2,764
Pension Liability Included in Accumulated Other Comprehensive Income	2,329	3,450
Other	352	342
Net Unrealized Losses on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income	0	1,259
Total Gross Deferred Tax Assets	13,774	12,946
Valuation Allowance for Deferred Tax Assets	0	0
Total Gross Deferred Tax Assets, Net of Valuation Allowance	13,774	12,946
Deferred Tax Liabilities:
Pension Plans	5,270	5,502
Depreciation	1,943	1,149
ROU assets	2,748
Deferred Income	3,215	3,003
Net Unrealized Gains on Equity Securities	240	166
Net Unrealized Gains on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income	160	0
Goodwill	3,502	3,546
Total Gross Deferred Tax Liabilities	17,078	13,366
Deferred Tax Liability, Net	$ 3,304	$ 420