Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive (loss) income	$ (2,173,000)	$ 3,190,000
Accumulated Other Comprehensive Income (Loss), Debt Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Before tax	5,782,000	12,571,000
Accumulated other comprehensive (loss) income, Tax effect	(1,214,000)	(2,640,000)
Total accumulated other comprehensive (loss) income	4,568,000	9,931,000
Accumulated Other Comprehensive Income (Loss), Pension [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income, Before tax	(8,533,000)	(8,533,000)
Accumulated other comprehensive (loss) income, Tax effect	1,792,000	1,792,000
Total accumulated other comprehensive (loss) income	$ (6,741,000)	$ (6,741,000)