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Investments - Schedule of Unrealized Loss on Investments (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
U.S. Government and Agency Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 81 | 44
Gross unrealized losses | $ 1,978 | $ 129
Fair value | $ 73,886 | $ 40,341
Twelve Months or More |  |
Number of securities | security | 10 | 18
Gross unrealized losses | $ 30 | $ 10
Fair value | $ 4,730 | $ 10,482
States, Municipalities and Political Subdivisions |  |
Less Than Twelve Months |  |
Number of securities | security | 77 | 22
Gross unrealized losses | $ 948 | $ 272
Fair value | $ 63,480 | $ 30,538
Twelve Months or More |  |
Number of securities | security | 2 | 0
Gross unrealized losses | $ 47 | $ 0
Fair value | $ 1,292 | $ 0
Public Utilities |  |
Less Than Twelve Months |  |
Number of securities | security | 24 | 8
Gross unrealized losses | $ 567 | $ 28
Fair value | $ 23,890 | $ 9,472
Twelve Months or More |  |
Number of securities | security | 0 | 0
Gross unrealized losses | $ 0 | $ 0
Fair value | $ 0 | $ 0
Corporate Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 227 | 40
Gross unrealized losses | $ 3,596 | $ 116
Fair value | $ 197,453 | $ 25,052
Twelve Months or More |  |
Number of securities | security | 2 | 3
Gross unrealized losses | $ 15 | $ 2
Fair value | $ 588 | $ 753
Mortgage-backed securities |  |
Less Than Twelve Months |  |
Number of securities | security | 176 | 87
Gross unrealized losses | $ 3,597 | $ 397
Fair value | $ 185,606 | $ 100,171
Twelve Months or More |  |
Number of securities | security | 14 | 8
Gross unrealized losses | $ 111 | $ 69
Fair value | $ 3,271 | $ 3,479
Asset-backed Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 58 | 21
Gross unrealized losses | $ 103 | $ 207
Fair value | $ 35,080 | $ 17,682
Twelve Months or More |  |
Number of securities | security | 4 | 1
Gross unrealized losses | $ 59 | $ 12
Fair value | $ 1,759 | $ 988
Redeemable Preferred Stocks |  |
Less Than Twelve Months |  |
Number of securities | security | 1 | 5
Gross unrealized losses | $ 2 | $ 13
Fair value | $ 89 | $ 358
Twelve Months or More |  |
Number of securities | security | 1 | 0
Gross unrealized losses | $ 7 | $ 0
Fair value | $ 92 | $ 0
Fixed Maturities |  |
Less Than Twelve Months |  |
Number of securities | security | 646 | 227
Gross unrealized losses | $ 10,804 | $ 1,162
Fair value | $ 583,000 | $ 223,614
Twelve Months or More |  |
Number of securities | security | 33 | 30
Gross unrealized losses | $ 269 | $ 93
Fair value | $ 11,732 | $ 15,702
Foreign Government |  |
Less Than Twelve Months |  |
Number of securities | security | 2 |
Gross unrealized losses | $ 13 |
Fair value | $ 3,516 |
Twelve Months or More |  |
Number of securities | security | 0 |
Gross unrealized losses | $ 0 |
Fair value | $ 0 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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