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Related Party Transactions - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Legal Fees
Related Party Transaction
Related Party Transaction, Amounts of Transaction			$ 2,407
Spouse of Executive Officer | Legal Fees
Related Party Transaction
Related Party Transaction, Amounts of Transaction			1,204
Related interest in billings (percentage)	50.00%
Director | AmRisc gross written premiums
Related Party Transaction
Related Party Transaction, Amounts of Transaction		$ 406,914	361,904
Director | AmRisc Fees and Commission
Related Party Transaction
Related Party Transaction, Amounts of Transaction		107,577	95,920
Director | AmRisc ceded premiums written
Related Party Transaction
Related Party Transaction, Amounts of Transaction		$ 6,253	$ 5,146

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- Definition

Related Party Transaction, Amounts Of Transaction, Related Party Ownership Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	uihc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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