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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

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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