Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,397,074	$ 1,389,038
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,623	8,682
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	169,649	158,739
Fixed maturity securities, available-for-sale	1,234,048	1,238,981
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,972	5,983
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	76	127
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	74	48
Fixed maturity securities, available-for-sale	5,974	6,062
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,396	3,404
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	201	250
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	1
Fixed maturity securities, available-for-sale	3,596	3,653
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	313,364	314,203
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,718	2,160
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	30,027	29,132
Fixed maturity securities, available-for-sale	285,055	287,231
Corporate Debt Securities Financial Sector Member [Domain]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	273,436	266,485
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,701	2,066
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	32,459	31,255
Fixed maturity securities, available-for-sale	242,678	237,296
Corporate Debt Security Consumer Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	252,953	250,672
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,321	2,145
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	39,615	37,094
Fixed maturity securities, available-for-sale	214,659	215,723
Corporate Debt Security Utilities Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	127,577	123,625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	369	615
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	21,576	20,253
Fixed maturity securities, available-for-sale	106,370	103,987
Corporate Debt Security Energy Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	72,733	73,808
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	27	64
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	8,576	8,049
Fixed maturity securities, available-for-sale	64,184	65,823
Corporate Debt Security Communications Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	73,354	74,029
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	247	309
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	9,843	8,892
Fixed maturity securities, available-for-sale	63,758	65,446
Corporate Debt Security All Other Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	111,641	111,124
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	444	647
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	14,289	12,439
Fixed maturity securities, available-for-sale	97,796	99,332
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	276	171
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	5	0
Fixed maturity securities, available-for-sale	272	171
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	106,977	107,174
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7	9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	12,136	10,060
Fixed maturity securities, available-for-sale	94,848	97,123
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	55,395	58,360
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	511	290
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,048	1,516
Fixed maturity securities, available-for-sale	$ 54,858	$ 57,134