Investments, Securities with Continuous Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2023 USD ($) Securities	Dec. 31, 2022 USD ($) Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	$ 31,191	$ 159,874
12 months or longer	167,384	33,773
Total	198,575	193,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	752	20,326
12 months or longer	23,609	8,464
Total	$ 24,361	$ 28,790
Number of securities in unrealized loss position \| Securities	243	237
Allowance for expected credit losses on available-for-sale fixed maturities	$ 0	$ 0
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	9,917	23,763
12 months or longer	35,838	19,259
Total	45,755	43,022
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	227	2,410
12 months or longer	5,097	3,516
Total	5,324	5,926
Allowance for expected credit losses on available-for-sale fixed maturities	0
Obligations of States and Political Subdivisions [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	0	8,183
12 months or longer	5,991	0
Total	5,991	8,183
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	0	1,702
12 months or longer	1,367	0
Total	1,367	1,702
Allowance for expected credit losses on available-for-sale fixed maturities	0
Corporate Securities [Member]
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]
Less than 12 months	21,274	127,928
12 months or longer	125,555	14,514
Total	146,829	142,442
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 months	525	16,214
12 months or longer	17,145	4,948
Total	17,670	$ 21,162
Allowance for expected credit losses on available-for-sale fixed maturities	$ 0

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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