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Investments (Unrealized Losses) (Details) $ in Thousands	Jun. 30, 2023 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	$ 740	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 20	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	3	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 65	$ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9	$ 9
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	$ 805	$ 64
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 29	$ 9
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	5	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	$ 220	$ 223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 3	$ 1
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	$ 220	$ 223
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3	$ 1
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	$ 94,929	$ 189,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 3,360	$ 30,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	121	242
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 112,451	$ 14,184
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 28,122	$ 7,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	141	14
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 207,380	$ 203,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 31,482	$ 37,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	262	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	$ 38,326	$ 182,447
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,768	$ 39,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	59	237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 152,433	$ 6,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 37,075	$ 3,261
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	195	16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 190,759	$ 188,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38,843	$ 42,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	254	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	$ 48,950	$ 164,224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,896	$ 34,823
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	57	220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 139,405	$ 23,417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 39,276	$ 12,315
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	189	30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 188,355	$ 187,641
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 42,172	$ 47,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	246	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	$ 16,392	$ 73,483
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 593	$ 15,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	58	152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 75,728	$ 16,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 21,737	$ 7,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	121	18
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 92,120	$ 89,896
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 22,330	$ 23,790
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	179	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	$ 12,636	$ 59,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 426	$ 9,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	17	75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 53,020	$ 5,617
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 9,760	$ 1,794
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	66	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 65,656	$ 64,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10,186	$ 11,395
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	83	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	$ 43,739	$ 140,955
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,959	$ 25,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	55	171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 108,752	$ 7,910
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 23,480	$ 3,711
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	133	15
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 152,491	$ 148,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25,439	$ 29,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	188	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	$ 168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4	$ 2
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	$ 168
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 4	$ 2
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	$ 82,833	$ 98,758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 7,194	$ 10,514
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	78	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 17,384	$ 759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,868	$ 251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	26	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 100,217	$ 99,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10,062	$ 10,765
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	104	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	$ 11,309	$ 37,067
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 285	$ 2,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	20	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 31,365	$ 4,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2,074	$ 282
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	35	9
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 42,674	$ 41,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,359	$ 2,767
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	55	50
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	$ 350,241	$ 945,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 18,508	$ 168,710
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	471	1,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 690,603	$ 78,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 164,401	$ 36,552
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	908	117
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,040,844	$ 1,024,234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 182,909	$ 205,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,379	1,353

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