Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets:
Net Unrealized Losses on Securities Available-for-Sale Included in Accumulated Other Comprehensive Income	$ 11,003	$ 16,914
Allowance for Credit Losses	8,475	8,199
Lease liabilities	2,635	2,821
Pension and Deferred Compensation Plans	3,708	3,571
Pension Liability Included in Accumulated Other Comprehensive Income	1,210	1,692
Historic Tax Credit	363	749
Other	781	745
Total Gross Deferred Tax Assets	28,175	34,691
Valuation Allowance for Deferred Tax Assets	0	0
Total Gross Deferred Tax Assets, Net of Valuation Allowance	28,175	34,691
Deferred Tax Liabilities:
Pension Plans	5,489	5,606
Depreciation	5,094	3,165
ROU assets	2,426	2,646
Deferred Income	3,905	3,266
Net Unrealized Gains on Equity Securities	207	272
Goodwill	3,379	3,416
Gain on Cash Flow Hedge Agreements Included in Accumulated Other Comprehensive Income	590	1,404
Total Gross Deferred Tax Liabilities	21,090	19,775
Deferred Tax Asset, Net	$ 7,085	$ 14,916