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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

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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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 twelve months or longer.

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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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