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Statutory Financial Information - Additional Information (Detail) - Wright Flood - USD ($) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018
Statutory Accounting Practices [Line Items] |  |
Statutory capital and surplus required | $ 7,500,000 |
Statutory capital and surplus | 27,900,000 | $ 19,400,000
Statutory net Income | $ 7,600,000 | $ 4,500,000

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