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Investments (Unrealized Losses) (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Debt security maturities rated investment grade, percent	99.00%	99.20%
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	$ 470	$ 835
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2	$ 51
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	2	3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 828	$ 435
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 90	$ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	6	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 1,298	$ 1,270
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 92	$ 115
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	8	8
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	$ 21,630	$ 42,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 382	$ 1,484
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	25	63
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 149,134	$ 147,534
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 27,372	$ 32,058
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	181	177
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 170,764	$ 190,117
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 27,754	$ 33,542
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	206	240
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	$ 17,197	$ 29,258
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 231	$ 756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	33	53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 147,423	$ 154,448
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 25,744	$ 32,529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	178	192
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 164,620	$ 183,706
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 25,975	$ 33,285
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	211	245
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	$ 25,206	$ 37,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 709	$ 2,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	31	57
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 159,917	$ 161,795
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 37,700	$ 43,902
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	218	216
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 185,123	$ 199,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 38,409	$ 45,955
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	249	273
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	$ 12,308	$ 16,750
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 178	$ 687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	34	47
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 79,033	$ 79,488
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 19,199	$ 22,083
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	140	142
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 91,341	$ 96,238
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 19,377	$ 22,770
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	174	189
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	$ 13,304	$ 11,654
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 160	$ 438
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	29	29
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 45,449	$ 52,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,270	$ 9,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	53	65
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 58,753	$ 64,191
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7,430	$ 9,959
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	82	94
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	$ 6,269	$ 9,973
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 49	$ 250
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	10	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 41,961	$ 48,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,411	$ 9,660
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	50	60
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 48,230	$ 58,435
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 7,460	$ 9,910
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	60	71
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	$ 7,481	$ 25,208
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 207	$ 1,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	17	38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 73,067	$ 68,756
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 15,007	$ 15,131
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	95	87
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 80,548	$ 93,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 15,214	$ 16,368
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	112	125
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	$ 100
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 0	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	0	1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 85	$ 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 2	$ 5
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	$ 85	$ 189
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2	$ 5
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1	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	$ 1,574	$ 160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2	$ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	7	11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 94,084	$ 93,231
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 8,371	$ 13,024
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	79	84
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 95,658	$ 93,391
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 8,373	$ 13,026
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	86	95
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	$ 4,728	$ 10,330
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 175	$ 243
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	7	14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 9,768	$ 14,741
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 358	$ 563
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	11	16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 14,496	$ 25,071
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 533	$ 806
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	18	30
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	$ 110,167	$ 184,082
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 2,095	$ 7,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	195	327
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 800,749	$ 821,516
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 148,524	$ 178,540
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,012	1,045
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 910,916	$ 1,005,598
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 150,619	$ 185,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,207	1,372

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