Accumulated Other Comprehensive Income (Loss) (Summary of Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (57,353,000)
Other comprehensive income (loss)	10,005,000	$ (57,097,000)
Ending balance	(47,348,000)	(57,353,000)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	10,005,000	(57,097,000)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(57,931,000)	(1,453,000)
Other comprehensive income (loss) before reclassification	9,924,000	(56,476,000)
Amount reclassified from accumulated other comprehensive loss	165,000	(2,000)
Other comprehensive income (loss)	10,089,000	(56,478,000)
Ending balance	(47,842,000)	(57,931,000)
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Unrealized gain on pension liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	578,000	1,197,000
Other comprehensive income (loss) before reclassification	(84,000)	(619,000)
Other comprehensive income (loss)	(84,000)	(619,000)
Ending balance	494,000	578,000
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(57,353,000)	(256,000)
Other comprehensive income (loss) before reclassification	9,840,000	(57,095,000)
Amount reclassified from accumulated other comprehensive loss	165,000	(2,000)
Other comprehensive income (loss)	10,005,000	(57,097,000)
Ending balance	$ (47,348,000)	$ (57,353,000)