Investments Unrealized Losses Less Than and Greater Than 12 Months (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items]
Credit valuation loss on fixed maturities AFS	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	184,082,000	64,080,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 7,201,000	$ 1,503,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	327	120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 821,516,000	$ 932,571,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 178,540,000	$ 157,236,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,045	1,142
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,005,598,000	$ 996,651,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 185,741,000	$ 158,739,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,372	1,262
Debt security maturities rated investment grade, percent	99.20%	99.40%
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 835,000	$ 1,203,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 51,000	$ 40,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 435,000	$ 65,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 64,000	$ 8,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	5	2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,270,000	$ 1,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 115,000	$ 48,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	8	7
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 221,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions		0
Debt Securities, Available-for-sale, Unrealized Loss Position		$ 221,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		1
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 42,583,000	$ 19,540,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,484,000	$ 357,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	63	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 147,534,000	$ 164,264,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 32,058,000	$ 28,775,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	177	192
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 190,117,000	$ 183,804,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 33,542,000	$ 29,132,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	240	227
Corporate Debt Security Financial Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 29,258,000	$ 12,584,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 756,000	$ 383,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	53	19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 154,448,000	$ 176,521,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 32,529,000	$ 30,872,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	192	217
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 183,706,000	$ 189,105,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 33,285,000	$ 31,255,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	245	236
Corporate Debt Security Consumer Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 37,231,000	$ 10,175,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,053,000	$ 265,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	57	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 161,795,000	$ 176,725,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 43,902,000	$ 36,829,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	216	223
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 199,026,000	$ 186,900,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 45,955,000	$ 37,094,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	273	239
Corporate Debt Security Utilities Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 16,750,000	$ 3,596,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 687,000	$ 66,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	47	20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 79,488,000	$ 85,169,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 22,083,000	$ 20,187,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	142	137
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 96,238,000	$ 88,765,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 22,770,000	$ 20,253,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	189	157
Corporate Debt Security Energy Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,654,000	$ 3,291,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 438,000	$ 57,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	29	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 52,537,000	$ 59,392,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,521,000	$ 7,992,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	65	76
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 64,191,000	$ 62,683,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9,959,000	$ 8,049,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	94	77
Corporate Debt Security Communications Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 9,973,000	$ 5,784,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 250,000	$ 153,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	11	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 48,462,000	$ 56,108,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,660,000	$ 8,739,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	60	69
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 58,435,000	$ 61,892,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9,910,000	$ 8,892,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	71	74
Corporate Debt Security All Other Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 25,208,000	$ 2,080,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,237,000	$ 32,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	38	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 68,756,000	$ 85,757,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 15,131,000	$ 12,407,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	87	100
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 93,964,000	$ 87,837,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 16,368,000	$ 12,439,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	125	105
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 100,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 89,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 5,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 189,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 5,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	2
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 160,000	$ 849,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,000	$ 38,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	11	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 93,231,000	$ 95,806,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 13,024,000	$ 10,022,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	84	86
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 93,391,000	$ 96,655,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 13,026,000	$ 10,060,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	95	91
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 10,330,000	$ 4,757,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 243,000	$ 111,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	14	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 14,741,000	$ 32,764,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 563,000	$ 1,405,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	16	40
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 25,071,000	$ 37,521,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 806,000	$ 1,516,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	30	48