Accumulated Other Comprehensive Income Balances Of Each Component Of Accumulated Other Comprehensive Income, Net Of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 3,100
Other comprehensive income	$ 50	$ 341	1,180	$ 2,246
Ending balance	4,280		4,280
Unrealized Gains and Losses On Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	4,294	2,886	3,132	981
Other comprehensive income before reclassifications	50	341	864	2,246
Amounts reclassified from accumulated other comprehensive income	0	0	348	0
Other comprehensive income	50	341	1,212	2,246
Ending balance	4,344	3,227	4,344	3,227
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(64)	(32)	(32)	(32)
Other comprehensive income before reclassifications	0	0	(32)	0
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other comprehensive income	0	0	(32)	0
Ending balance	(64)	(32)	(64)	(32)
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	4,230	2,854	3,100	949
Other comprehensive income before reclassifications	50	341	832	2,246
Amounts reclassified from accumulated other comprehensive income	0	0	348	0
Other comprehensive income	50	341	1,180	2,246
Ending balance	$ 4,280	$ 3,195	$ 4,280	$ 3,195