Investments Unrealized Losses Less Than and Greater Than 12 Months (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 64,080	$ 945,462
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1,503	$ 168,710
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	120	1,236
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 932,571	$ 78,772
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 157,236	$ 36,552
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	1,142	117
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 996,651	$ 1,024,234
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 158,739	$ 205,262
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	1,262	1,353
Debt security maturities rated investment grade, percent	99.40%	98.70%
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,203	$ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 40	$ 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	$ 64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 8	$ 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	$ 1,268	$ 64
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 48	$ 9
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	7	2
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 221	$ 223
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 1	$ 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	$ 221	$ 223
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1	$ 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 [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 19,540	$ 189,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 357	$ 30,866
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	35	242
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 164,264	$ 14,184
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 28,775	$ 7,098
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	192	14
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 183,804	$ 203,268
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 29,132	$ 37,964
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	227	256
Corporate Debt Security Financial Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 12,584	$ 182,447
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 383	$ 39,122
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	19	237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 176,521	$ 6,144
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 30,872	$ 3,261
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	217	16
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 189,105	$ 188,591
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 31,255	$ 42,383
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	236	253
Corporate Debt Security Consumer Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 10,175	$ 164,224
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 265	$ 34,823
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	16	220
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 176,725	$ 23,417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 36,829	$ 12,315
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	223	30
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 186,900	$ 187,641
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 37,094	$ 47,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	239	250
Corporate Debt Security Utilities Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,596	$ 73,483
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 66	$ 15,959
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	20	152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 85,169	$ 16,413
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 20,187	$ 7,831
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	137	18
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 88,765	$ 89,896
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 20,253	$ 23,790
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	157	170
Corporate Debt Security Energy Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,291	$ 59,053
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 57	$ 9,601
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	1	75
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 59,392	$ 5,617
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 7,992	$ 1,794
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	76	8
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 62,683	$ 64,670
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 8,049	$ 11,395
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	77	83
Corporate Debt Security All Other Sector
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 7,864	$ 140,955
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 185	$ 25,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	10	171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 141,865	$ 7,910
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 21,146	$ 3,711
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	$ 149,729	$ 148,865
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 21,331	$ 29,048
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	179	186
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		$ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions		2
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		$ 168
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 2
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions		2
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 849	$ 98,758
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 38	$ 10,514
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	5	95
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 95,806	$ 759
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 10,022	$ 251
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	86	5
Debt Securities, Available-for-sale, Unrealized Loss Position	$ 96,655	$ 99,517
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 10,060	$ 10,765
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	91	100
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 4,757	$ 37,067
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ 111	$ 2,485
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	8	41
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	$ 32,764	$ 4,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 1,405	$ 282
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	$ 37,521	$ 41,331
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,516	$ 2,767
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	48	50