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Investments - Summary of Fixed Maturities with Unrealized Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 178,424	$ 67,740
Less Than 12 Months, Unrealized Losses	2,666	629
More Than 12 Months, Fair Value	3,862	8,466
More Than 12 Months, Unrealized Losses	127	277
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	38,202	29,144
Less Than 12 Months, Unrealized Losses	1,088	345
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	45,446	9,362
Less Than 12 Months, Unrealized Losses	819	154
More Than 12 Months, Fair Value	0
More Than 12 Months, Unrealized Losses	0
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	38,846	26,143
Less Than 12 Months, Unrealized Losses	344	115
More Than 12 Months, Fair Value	3,375	8,230
More Than 12 Months, Unrealized Losses	125	276
Mortgage-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	55,930	3,091
Less Than 12 Months, Unrealized Losses	415	15
More Than 12 Months, Fair Value	487	236
More Than 12 Months, Unrealized Losses	$ 2	$ 1

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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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No definition available.

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- Definition

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