Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities
Fair Value at Sale	$ 267,198	$ 811,260	$ 213,979
Fair Value at Sale	257,359	31,615	45,995
Net Fair Value at Sale	524,557	842,875	259,974
Debt Securities, Available-for-sale, Realized Gain (Loss)	7,681	70,785	1,772
Debt Securities, Available-for-sale, Realized Loss	4,114	4,094	544
Debt Securities, Available-for-sale, Realized Gain (Loss)	3,567	66,691	1,228
Fixed Maturities
Schedule of Available-for-sale Securities
Fair Value at Sale	221,597	678,736	209,302
Fair Value at Sale	220,809	16,552	43,573
Debt Securities, Available-for-sale, Realized Gain (Loss)	2,112	32,460	1,678
Debt Securities, Available-for-sale, Realized Loss	4,050	478	324
Equity Securities
Schedule of Available-for-sale Securities
Fair Value at Sale	12,116	131,178	814
Fair Value at Sale	575	13,805	1,387
Equity Securities, FV-NI, Realized Gain	5,569	38,325	94
Equity Securities, FV-NI, Realized Loss	18	3,602	219
Short-term Investments
Schedule of Available-for-sale Securities
Fair Value at Sale	33,485	1,346	3,863
Fair Value at Sale	35,975	1,258	1,035
Debt Securities, Available-for-sale, Realized Gain (Loss)	0	0	0
Debt Securities, Available-for-sale, Realized Loss	$ 46	$ 14	$ 1

Available-for-sale, Gross Realized Gains, Fair Value at Sale

No definition available.

Name:	uihc_AvailableForSaleGrossRealizedGainsFairValueAtSale
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Available-for-sale, Gross Realized Gains (Losses), Fair Value at Sale

+ References

No definition available.

+ Details

Name:	uihc_AvailableForSaleGrossRealizedGainsLossesFairValueAtSale
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Available-for-sale, Gross Realized Losses, Fair Value at Sale

+ References

No definition available.

+ Details

Name:	uihc_AvailableForSaleGrossRealizedLossesFairValueAtSale
Namespace Prefix:	uihc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123583765&loc=SL75117546-209714

+ Details

Name:	us-gaap_EquitySecuritiesFvNiRealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

+ Details

Name:	us-gaap_EquitySecuritiesFvNiRealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_FixedMaturitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: