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Investments (Unrealized Losses) (Details) $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt security maturities rated investment grade, percent	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	$ 569	$ 1,203
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 16	$ 40
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	2	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 315	$ 65
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 13	$ 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	4	2
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 884	$ 1,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 29	$ 48
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	6	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		$ 221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 1
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
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 1
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, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 12,007	$ 19,540
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 126	$ 357
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	21	35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 160,393	$ 164,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 23,814	$ 28,775
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	180	192
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 172,400	$ 183,804
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 23,940	$ 29,132
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	201	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	$ 11,511	$ 12,584
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 27	$ 383
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	8	19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 165,303	$ 176,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 24,150	$ 30,872
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	194	217
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 176,814	$ 189,105
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 24,177	$ 31,255
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	202	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	$ 8,889	$ 10,175
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 122	$ 265
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	14	16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 173,308	$ 176,725
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 32,604	$ 36,829
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	$ 182,197	$ 186,900
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 32,726	$ 37,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	230	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	$ 2,805	$ 3,596
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 132	$ 66
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	8	20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 86,941	$ 85,169
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 17,115	$ 20,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	146	137
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 89,746	$ 88,765
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 17,247	$ 20,253
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	154	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	$ 3,199	$ 3,291
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 4	$ 57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	4	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 55,625	$ 59,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 6,531	$ 7,992
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	$ 58,824	$ 62,683
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 6,535	$ 8,049
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	69	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	$ 2,749	$ 5,784
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 34	$ 153
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	4	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 50,790	$ 56,108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,466	$ 8,739
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	$ 53,539	$ 61,892
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7,500	$ 8,892
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	64	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	$ 10,989	$ 2,080
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 97	$ 32
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	18	5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 71,434	$ 85,757
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 10,578	$ 12,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	84	100
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 82,423	$ 87,837
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10,675	$ 12,439
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	102	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	$ 0
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	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 96
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2
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	$ 96
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1
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	$ 46	$ 849
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 38
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	$ 98,714	$ 95,806
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,633	$ 10,022
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	$ 98,760	$ 96,655
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7,633	$ 10,060
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	87	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	$ 3,973	$ 4,757
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 71	$ 111
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	4	8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 16,507	$ 32,764
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 582	$ 1,405
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	18	40
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 20,480	$ 37,521
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 653	$ 1,516
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	22	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	$ 56,737	$ 64,080
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 629	$ 1,503
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	86	120
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 879,426	$ 932,571
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 130,488	$ 157,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,052	1,142
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 936,163	$ 996,651
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 131,117	$ 158,739
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,138	1,262

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