Comprehensive Income (Loss) (Reclassification From Accumulated Other Comprehensive Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	$ (439,010,000)	$ 179,192,000	$ (167,630,000)
Other underwriting expenses	6,902,000	6,356,000	8,426,000
Income tax expense (benefit)	(1,449,000)	(1,335,000)	(2,949,000)
Net income (loss)	5,453,000	5,021,000	5,477,000
URA(D) On Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	6,068	3,416,000	3,543,000
Income tax expense (benefit)	(988,000)	(1,395,000)	(1,240,000)
Net income (loss)	5,080	2,021,000	$ 2,303,000
URA(D) On Securities [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other net realized capital gains (losses)	6,068,000	3,416,000
Income tax expense (benefit)	(988,000)	(1,395,000)
Net income (loss)	5,080,000	2,021,000
Benefit Plan Net Gain (Loss) [Member] | Reclassification From Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other underwriting expenses	6,902,000	6,356,000
Income tax expense (benefit)	(1,449,000)	(1,335,000)
Net income (loss)	$ 5,453,000	$ 5,021,000