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Investments (Unrealized Losses) (Details)	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt security maturities rated investment grade, percent	99.00%		99.00%
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,210,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 105,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	5		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 65,000		$ 64,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,000		$ 9,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	2		2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,275,000		$ 64,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 114,000		$ 9,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	7		2
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 219,000		$ 223,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 3,000		$ 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0		0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 219,000		$ 223,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3,000		$ 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1		1
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 66,573,000		$ 189,084,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,405,000		$ 30,866,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	94		242
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 157,245,000		$ 14,184,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 40,560,000		$ 7,098,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	198		14
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 223,818,000		$ 203,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 42,965,000		$ 37,964,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	292		256
Corporate Debt Securities Financial Sector Member [Domain]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 35,347,000		$ 182,447,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,343,000		$ 39,122,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	53		237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 164,356,000		$ 6,144,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 46,233,000		$ 3,261,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	221		16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 199,703,000		$ 188,591,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 48,576,000		$ 42,383,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	274		253
Corporate Debt Security Consumer Sector
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 23,441,000		$ 164,224,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,913,000		$ 34,823,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	33		220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 160,871,000		$ 23,417,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 52,889,000		$ 12,315,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	222		30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 184,312,000		$ 187,641,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 54,802,000		$ 47,138,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	255		250
Corporate Debt Security Utilities Sector
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 14,964,000		$ 73,483,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,173,000		$ 15,959,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	54		152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 78,285,000		$ 16,413,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 27,410,000		$ 7,831,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	138		18
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 93,249,000		$ 89,896,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 28,583,000		$ 23,790,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	192		170
Corporate Debt Security Energy Sector
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 6,103,000		$ 59,053,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 337,000		$ 9,601,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	9		75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 57,011,000		$ 5,617,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 12,967,000		$ 1,794,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	79		8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 63,114,000		$ 64,670,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 13,304,000		$ 11,395,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	88		83
Corporate Debt Security All Other Sector
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 16,510,000		$ 140,955,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,091,000		$ 25,337,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	25		171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 130,532,000		$ 7,910,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 32,950,000		$ 3,711,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	169		15
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 147,042,000		$ 148,865,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 34,041,000		$ 29,048,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	194		186
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 167,000		$ 168,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4,000		$ 2,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	2		2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 0		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	0		0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 167,000		$ 168,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4,000		$ 2,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	2		2
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,159,000		$ 98,758,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 92,000		$ 10,514,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	20		95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 91,325,000		$ 759,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 16,368,000		$ 251,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	89		5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 92,484,000		$ 99,517,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 16,460,000		$ 10,765,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	109		100
Asset-backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 11,936,000		$ 37,067,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 666,000		$ 2,485,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	17		41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 32,756,000		$ 4,264,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,840,000		$ 282,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	40		9
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 44,692,000		$ 41,331,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,506,000		$ 2,767,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	57		50
Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	177,629,000		$ 945,462,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 10,132,000		$ 168,710,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	313		1,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 872,446,000		$ 78,772,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 231,226,000		$ 36,552,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,158		117
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,050,075,000		$ 1,024,234,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 241,358,000		$ 205,262,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,471		1,353

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