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Investments - Schedule of Unrealized Loss on Investments (Details) $ in Thousands | Jun. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
U.S. Government and Agency Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 51 | 44
Gross unrealized losses | $ 1,750 | $ 129
Fair value | $ 31,218 | $ 40,341
Twelve Months or More |  |
Number of securities | security | 11 | 18
Gross unrealized losses | $ 3 | $ 10
Fair value | $ 5,774 | $ 10,482
States, Municipalities and Political Subdivisions |  |
Less Than Twelve Months |  |
Number of securities | security | 2 | 22
Gross unrealized losses | $ 797 | $ 272
Fair value | $ 6,502 | $ 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 | 17 | 8
Gross unrealized losses | $ 576 | $ 28
Fair value | $ 20,820 | $ 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 | 165 | 40
Gross unrealized losses | $ 3,114 | $ 116
Fair value | $ 149,532 | $ 25,052
Twelve Months or More |  |
Number of securities | security | 3 | 3
Gross unrealized losses | $ 14 | $ 2
Fair value | $ 843 | $ 753
Mortgage-backed securities |  |
Less Than Twelve Months |  |
Number of securities | security | 227 | 87
Gross unrealized losses | $ 2,996 | $ 397
Fair value | $ 271,163 | $ 100,171
Twelve Months or More |  |
Number of securities | security | 6 | 8
Gross unrealized losses | $ 9 | $ 69
Fair value | $ 369 | $ 3,479
Asset-backed Securities |  |
Less Than Twelve Months |  |
Number of securities | security | 39 | 21
Gross unrealized losses | $ 76 | $ 207
Fair value | $ 23,923 | $ 17,682
Twelve Months or More |  |
Number of securities | security | 4 | 1
Gross unrealized losses | $ 65 | $ 12
Fair value | $ 1,813 | $ 988
Redeemable Preferred Stocks |  |
Less Than Twelve Months |  |
Number of securities | security | 10 | 5
Gross unrealized losses | $ 30 | $ 13
Fair value | $ 685 | $ 358
Twelve Months or More |  |
Number of securities | security | 1 | 0
Gross unrealized losses | $ 4 | $ 0
Fair value | $ 95 | $ 0
Fixed Maturities |  |
Less Than Twelve Months |  |
Number of securities | security | 511 | 227
Gross unrealized losses | $ 9,339 | $ 1,162
Fair value | $ 503,843 | $ 223,614
Twelve Months or More |  |
Number of securities | security | 25 | 30
Gross unrealized losses | $ 95 | $ 93
Fair value | $ 8,894 | $ 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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