Investments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Gross gains on investments	$ 6,700	$ 22,800
Realized gains on sale of investments	5,900	21,000
Gross losses on investments	700	20,700
Realized losses on sale of investments	500	20,200
Proceeds from sale of investment securities	23,100	155,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Other-than-temporary impairment	$ 0	$ 1,692
Number of securities sold | security	0	1
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment	$ 0	$ 0
Securities pledged for the benefit of various state insurance departments and reinsurers	$ 30,000	$ 29,700
Equity Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of debt securities with unrealized loss | security	14	13
Number of debt securities with unrealized loss, less than 12 months | security	10	6
Number of debt securities with unrealized loss, greater than 12 months | security	4	7
Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of debt securities with unrealized loss | security	100	81
Number of debt securities with unrealized loss, less than 12 months | security	74	64
Number of debt securities with unrealized loss, greater than 12 months | security	26	17