Investments (Investment Gains and Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,389,390	$ 1,381,318
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,321	3,563
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	241,358	205,262
Fixed maturity securities, available-for-sale	1,151,353	1,179,619
US Treasury Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	5,700	9,425
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	241	152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	114	9
Fixed maturity securities, available-for-sale	5,827	9,568
US Government Agencies Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,411	3,434
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	122	277
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3	1
Fixed maturity securities, available-for-sale	3,530	3,710
US States and Political Subdivisions Debt Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	325,314	344,208
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,607	1,114
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	42,965	37,964
Fixed maturity securities, available-for-sale	283,956	307,358
Corporate Debt Securities Financial Sector Member [Domain]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	256,108	243,758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	149	512
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	48,576	42,383
Fixed maturity securities, available-for-sale	207,681	201,887
Corporate Debt Security Consumer Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	249,857	247,824
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	545	758
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	54,802	47,138
Fixed maturity securities, available-for-sale	195,600	201,444
Corporate Debt Security Utilities Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	121,874	115,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	39
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	28,583	23,790
Fixed maturity securities, available-for-sale	93,292	91,987
Corporate Debt Security Energy Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	76,418	76,065
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	13,304	11,395
Fixed maturity securities, available-for-sale	63,114	64,670
Corporate Debt Security All Other Sector
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	184,859	184,022
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	236	683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	34,041	29,048
Fixed maturity securities, available-for-sale	151,054	155,657
Commercial Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	171	171
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	4	2
Fixed maturity securities, available-for-sale	167	169
Residential Mortgage Backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	108,976	110,582
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	16,460	10,765
Fixed maturity securities, available-for-sale	92,519	99,826
Asset-backed Securities [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	56,702	45,991
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	417	18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,506	2,767
Fixed maturity securities, available-for-sale	$ 54,613	43,242
Foreign Government, Non-US [Member]
Gross Unrealized Gains and Losses [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		100
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0
Fixed maturity securities, available-for-sale		$ 101

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) 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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Amortized cost of 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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