Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Asset
Net operating loss and tax credit carryforward	$ 9,593,000	$ 10,421,000
Allowance for loan losses	8,693,000	5,416,000
Net unrealized losses on AFS securities	0	0
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	(8,027,000)	(890,000)
Pension and other benefits	4,878,000	4,492,000
Net unrealized losses on derivative instruments	1,267,000	1,656,000
Deferred compensation and benefits	961,000	919,000
Other
Total	25,392,000	22,904,000
Liability
Depreciation	(3,204,000)	(3,053,000)
Deferred loan origination fees	(2,111,000)	(2,119,000)
Other	94,000	19,000
Total	(13,436,000)	(6,081,000)
Valuation allowance on deferred tax assets	0	0
Net deferred tax assets	$ 11,956,000	$ 16,823,000