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Investments (Unrealized Losses) (Details) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 68,000 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 5,000 |
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 | $ 68,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 5,000 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 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 | $ 93,810,000 | $ 21,715,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 9,274,000 | $ 692,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 103 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 807,000 | $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 207,000 | $ 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 | $ 94,617,000 | $ 21,715,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 9,481,000 | $ 692,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 105 | 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 | $ 100,331,000 | $ 8,059,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 8,800,000 | $ 86,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 124 | 15
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 1,075,000 | $ 1,227,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 236,000 | $ 86,000
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 | $ 101,406,000 | $ 9,286,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 9,036,000 | $ 172,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 125 | 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 | $ 118,748,000 | $ 29,494,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 11,657,000 | $ 777,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 139 | 28
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 3,348,000 | $ 2,419,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 718,000 | $ 123,000
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 | $ 122,096,000 | $ 31,913,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 12,375,000 | $ 900,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 146 | 29
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 | $ 30,597,000 | $ 7,381,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 1,905,000 | $ 68,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 37 | 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 | $ 30,597,000 | $ 7,381,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 1,905,000 | $ 68,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 37 | 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 | $ 139,085,000 | $ 33,384,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 11,752,000 | $ 781,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 187 | 30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 8,747,000 | $ 4,523,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 1,962,000 | $ 400,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 6 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 147,832,000 | $ 37,907,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 13,714,000 | $ 1,181,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 193 | 34
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 | $ 4,793,000 | $ 1,084,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 235,000 | $ 6,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 14 | 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 | $ 4,793,000 | $ 1,084,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 235,000 | $ 6,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 14 | 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 | $ 21,315,000 | $ 9,078,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 99,000 | $ 12,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 24 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 662,000 | $ 663,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,000 | $ 2,000
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 | $ 21,977,000 | $ 9,741,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 102,000 | $ 14,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 25 | 12
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 508,747,000 | $ 110,267,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ 43,727,000 | $ 2,423,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | 630 | 115
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 14,639,000 | $ 8,832,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 3,126,000 | $ 611,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | 17 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 523,386,000 | $ 119,099,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 46,853,000 | $ 3,034,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 647 | 122
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 |  | $ 72,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | $ 1,000
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 |  | $ 72,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss |  | $ 1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions |  | 2

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