Investments (Equity Securities) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt and Equity Securities, FV-NI [Line Items]
Equity security	$ 21,151,000		$ 21,151,000		$ 16,033,000
Realized investment gains (losses), net	527,000	$ 72,000	669,000	$ 3,164,000
Stock Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	2,833,000		2,833,000		3,274,000
Bond Mutual Funds [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	11,935,000		11,935,000		12,311,000
Common stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	1,145,000		1,145,000		134,000
Non-redeemable Preferred Stock [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	267,000		267,000		314,000
Equity Securities [Member]
Debt and Equity Securities, FV-NI [Line Items]
Realized investment gains (losses), net	400,000	$ 18,000.0	600,000	$ 800,000
CIA_NonredeemablePreferredStockFundMember [Member]
Debt and Equity Securities, FV-NI [Line Items]
Equity security	$ 4,971,000		$ 4,971,000		$ 0