Accumulated Other Comprehensive Income (Loss) (Reclassification adjustments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income before federal income tax expense	$ 11,872	$ 14,404	$ 15,384
Labor and Related Expense	23,772	23,205	22,609
Federal income tax expense	(987)	(1,380)	(1,363)
NET INCOME	10,885	13,024	14,021
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net gains (losses) on sale of AFS securities	71	6	0
Federal income tax expense	(15)	(1)	0
NET INCOME	56	5	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plan [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Labor and Related Expense	176	268	345
Federal income tax expense	(37)	(56)	(72)
NET INCOME	$ 139	$ 212	$ 273