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Investments - Schedule of Unrealized Loss on Investments (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
U.S. Government and Agency Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 70 | 44
Gross unrealized losses | $ 2,661 | $ 129
Fair value | $ 73,990 | $ 40,341
Twelve Months or More |  |
Number of securities | security | 14 | 18
Gross unrealized losses | $ 4 | $ 10
Fair value | $ 7,778 | $ 10,482
States, Municipalities and Political Subdivisions |  |
Less Than Twelve Months |  |
Number of securities | security | 91 | 22
Gross unrealized losses | $ 1,790 | $ 272
Fair value | $ 73,926 | $ 30,538
Twelve Months or More |  |
Number of securities | security | 0 | 0
Gross unrealized losses | $ 0 | $ 0
Fair value | $ 0 | $ 0
Public Utilities |  |
Less Than Twelve Months |  |
Number of securities | security | 18 | 8
Gross unrealized losses | $ 1,103 | $ 28
Fair value | $ 20,661 | $ 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 | 194 | 40
Gross unrealized losses | $ 6,497 | $ 116
Fair value | $ 155,057 | $ 25,052
Twelve Months or More |  |
Number of securities | security | 7 | 3
Gross unrealized losses | $ 54 | $ 2
Fair value | $ 2,325 | $ 753
Mortgage-backed securities |  |
Less Than Twelve Months |  |
Number of securities | security | 160 | 87
Gross unrealized losses | $ 4,951 | $ 397
Fair value | $ 182,028 | $ 100,171
Twelve Months or More |  |
Number of securities | security | 6 | 8
Gross unrealized losses | $ 22 | $ 69
Fair value | $ 730 | $ 3,479
Asset-backed Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 48 | 21
Gross unrealized losses | $ 168 | $ 207
Fair value | $ 32,456 | $ 17,682
Twelve Months or More |  |
Number of securities | security | 8 | 1
Gross unrealized losses | $ 124 | $ 12
Fair value | $ 3,245 | $ 988
Redeemable Preferred Stocks |  |
Less Than Twelve Months |  |
Number of securities | security | 11 | 5
Gross unrealized losses | $ 9 | $ 13
Fair value | $ 898 | $ 358
Twelve Months or More |  |
Number of securities | security | 1 | 0
Gross unrealized losses | $ 5 | $ 0
Fair value | $ 94 | $ 0
Fixed Maturities |  |
Less Than Twelve Months |  |
Number of securities | security | 592 | 227
Gross unrealized losses | $ 17,179 | $ 1,162
Fair value | $ 539,016 | $ 223,614
Twelve Months or More |  |
Number of securities | security | 36 | 30
Gross unrealized losses | $ 209 | $ 93
Fair value | $ 14,172 | $ 15,702

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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 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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