CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 66,371,000	$ 65,696,000
Fixed maturities, allowance for credit losses	4,000	23,000
Equity securities, cost	717,000	635,000
Commercial mortgage loans, allowance for credit losses	171,000	222,000
Reinsurance receivables, allowance for credit loss	90,000	94,000
Other intangibles, accumulated amortization	326,000	312,000
Property and equipment, accumulated depreciation	$ 66,000	$ 61,000
Preferred Stock, par value (in dollars per share)	$ 1	$ 1
Preferred Stock, shares authorized (in shares)	2,000	2,000
Preferred Stock, Liquidation preference	$ 2	$ 2
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	5,000,000	5,000,000
Common Stock, shares issued (in shares)	5,000,000	5,000,000
Net unrealized gains (losses) on investments, income tax	$ 469,000	$ 946,000
Net unrealized gains (losses) on investments with an allowance for credit losses, tax expense (benefit)	1,000	(1,000)
Accumulated gain (loss) - derivatives, income tax expense (benefit)	$ (2,000)	$ (2,000)