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Stockholders' Equity Narrative (Details) $ in Thousands | Sep. 30, 2021 USD ($)
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Stockholders' Equity Narrative [Abstract] |
Stock Repurchase Program, Authorized Amount | $ 25,000

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- Definition Stockholders' Equity Narrative [Abstract] + References No definition available. + Details
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Namespace Prefix: | uihc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant