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Investments (Unrealized Losses) (Details) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |
Debt security maturities rated investment grade, percent | 97.60% | 98.00%
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 66 | $ 72
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 7 | $ 1
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 | $ 66 | $ 72
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 7 | $ 1
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 2 | 2
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 | $ 149,297 | $ 21,715
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 21,429 | $ 692
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 171 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 720 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 294 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 2 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 150,017 | $ 21,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 21,723 | $ 692
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 173 | 15
Corporate Debt Securities Financial Sector Member [Domain] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 181,314 | $ 8,059
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 29,539 | $ 86
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 218 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 887 | $ 1,227
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 422 | $ 86
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 | $ 182,201 | $ 9,286
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 29,961 | $ 172
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 219 | 16
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 | $ 175,856 | $ 29,494
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 30,776 | $ 777
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 213 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 2,842 | $ 2,419
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,220 | $ 123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 7 | 1
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 178,698 | $ 31,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 31,996 | $ 900
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 220 | 29
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 | $ 83,987 | $ 19,072
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 15,311 | $ 401
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 132 | 14
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 4,986 | $ 4,523
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 2,343 | $ 400
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 5 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 88,973 | $ 23,595
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 17,654 | $ 801
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 137 | 18
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 | $ 64,778 | $ 7,381
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 8,884 | $ 68
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 77 | 8
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 | $ 64,778 | $ 7,381
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 8,884 | $ 68
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 77 | 8
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 | $ 146,713 | $ 14,312
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 21,215 | $ 380
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 171 | 16
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 2,427 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 935 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 1 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 149,140 | $ 14,312
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 22,150 | $ 380
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 172 | 16
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 | $ 82,801 | $ 1,084
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 2,133 | $ 6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 72 | 6
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 | $ 82,801 | $ 1,084
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 2,133 | $ 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 72 | 6
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 30,469 | $ 9,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,436 | $ 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 35 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 1,643 | $ 663
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 77 | $ 2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 2 | 1
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 32,112 | $ 9,741
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,513 | $ 14
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 37 | 12
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 915,281 | $ 110,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 130,730 | $ 2,423
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 1,091 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 13,505 | $ 8,832
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 5,291 | $ 611
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 18 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 928,786 | $ 119,099
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 136,021 | $ 3,034
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 1,109 | 122

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