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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

Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months [Abstract]

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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.

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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 less than twelve months.

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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.

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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.

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Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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