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Investments (Unrealized Losses) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff	$ 0	$ 0	$ 0	$ 0
Debt security maturities rated investment grade, percent	99.20%		99.20%		99.40%
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	$ 667,000		$ 667,000		$ 1,203,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 62,000		$ 62,000		$ 40,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3		3		5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 559,000		$ 559,000		$ 65,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 32,000		$ 32,000		$ 8,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	4		4		2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,226,000		$ 1,226,000		$ 1,268,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 94,000		$ 94,000		$ 48,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	7		7		7
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	$ 0		$ 0		$ 221,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0		$ 0		$ 1,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0		0		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 220,000		$ 220,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,000		$ 1,000		$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1		1		0
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 220,000		$ 220,000		$ 221,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,000		$ 1,000		$ 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1		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	$ 25,258,000		$ 25,258,000		$ 19,540,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 275,000		$ 275,000		$ 357,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	32		32		35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 169,451,000		$ 169,451,000		$ 164,264,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 31,415,000		$ 31,415,000		$ 28,775,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	209		209		192
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 194,709,000		$ 194,709,000		$ 183,804,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 31,690,000		$ 31,690,000		$ 29,132,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	241		241		227
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	$ 23,367,000		$ 23,367,000		$ 12,584,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 442,000		$ 442,000		$ 383,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	49		49		19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 175,029,000		$ 175,029,000		$ 176,521,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 34,392,000		$ 34,392,000		$ 30,872,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	214		214		217
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 198,396,000		$ 198,396,000		$ 189,105,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 34,834,000		$ 34,834,000		$ 31,255,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	263		263		236
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	$ 18,537,000		$ 18,537,000		$ 10,175,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 642,000		$ 642,000		$ 265,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	40		40		16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 175,453,000		$ 175,453,000		$ 176,725,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 42,644,000		$ 42,644,000		$ 36,829,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	227		227		223
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 193,990,000		$ 193,990,000		$ 186,900,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 43,286,000		$ 43,286,000		$ 37,094,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	267		267		239
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	$ 13,900,000		$ 13,900,000		$ 3,596,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 582,000		$ 582,000		$ 66,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	45		45		20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 83,076,000		$ 83,076,000		$ 85,169,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 22,714,000		$ 22,714,000		$ 20,187,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	149		149		137
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 96,976,000		$ 96,976,000		$ 88,765,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 23,296,000		$ 23,296,000		$ 20,253,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	194		194		157
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	$ 7,875,000		$ 7,875,000		$ 3,291,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 81,000		$ 81,000		$ 57,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	25		25		1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 60,455,000		$ 60,455,000		$ 59,392,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,521,000		$ 9,521,000		$ 7,992,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	74		74		76
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 68,330,000		$ 68,330,000		$ 62,683,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 9,602,000		$ 9,602,000		$ 8,049,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	99		99		77
Corporate Debt Security Communications Sector
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,997,000		$ 1,997,000		$ 5,784,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 51,000		$ 51,000		$ 153,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3		3		5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 56,077,000		$ 56,077,000		$ 56,108,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 10,200,000		$ 10,200,000		$ 8,739,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	67		67		69
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 58,074,000		$ 58,074,000		$ 61,892,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10,251,000		$ 10,251,000		$ 8,892,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	70		70		74
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	$ 7,140,000		$ 7,140,000		$ 2,080,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 233,000		$ 233,000		$ 32,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	18		18		5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 80,830,000		$ 80,830,000		$ 85,757,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 15,253,000		$ 15,253,000		$ 12,407,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	97		97		100
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 87,970,000		$ 87,970,000		$ 87,837,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15,486,000		$ 15,486,000		$ 12,439,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	115		115		105
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	$ 120,000		$ 120,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,000		$ 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	$ 96,000		$ 96,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 5,000		$ 5,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1		1
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 216,000		$ 216,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 6,000		$ 6,000
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	$ 155,000		$ 155,000		$ 849,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,000		$ 2,000		$ 38,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	9		9		5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 93,954,000		$ 93,954,000		$ 95,806,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 12,484,000		$ 12,484,000		$ 10,022,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	87		87		86
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 94,109,000		$ 94,109,000		$ 96,655,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 12,486,000		$ 12,486,000		$ 10,060,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	96		96		91
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	$ 10,188,000		$ 10,188,000		$ 4,757,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 119,000		$ 119,000		$ 111,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	17		17		8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 18,755,000		$ 18,755,000		$ 32,764,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 881,000		$ 881,000		$ 1,405,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	22		22		40
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 28,943,000		$ 28,943,000		$ 37,521,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,000,000		$ 1,000,000		$ 1,516,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	39		39		48
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	$ 109,204,000		$ 109,204,000		$ 64,080,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,490,000		$ 2,490,000		$ 1,503,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	242		242		120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 913,955,000		$ 913,955,000		$ 932,571,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 179,542,000		$ 179,542,000		$ 157,236,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,152		1,152		1,142
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,023,159,000		$ 1,023,159,000		$ 996,651,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 182,032,000		$ 182,032,000		$ 158,739,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,394		1,394		1,262

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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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