Represents the number of business units of the entity.

No definition available.

Name:	hth_NumberOfBusinessUnits
Namespace Prefix:	hth_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents line items for significant accounting policies table.

+ References

No definition available.

+ Details

Name:	hth_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix:	hth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

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

- Details

Name:	srt_OwnershipAxis=hth_PlainsCapitalCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_SecuritiesHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_HthHillcrestProjectLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_HilltopInvestmentsILlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hth_PlainsCapitalCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_PlainsCapitalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_HilltopOpportunityPartnersLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_PCCStatutoryTrustsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hth_PlainsCapitalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_PrimeLendingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hth_PrimeLendingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_PrimeLendingVenturesManagementLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=hth_HilltopInvestmentsILlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_OwnershipAxis=hth_HthDiamondHillcrestLandLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Summary of Significant Accounting and Reporting Policies - Basis of Presentation, Ownership (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)
Basis of Presentation
Number of primary business units \| item		2
Redemption of junior subordinated debentures		$ 410,832	$ 473,891
PCC
Basis of Presentation
Ownership percentage		100.00%
Securities Holdings
Basis of Presentation
Ownership percentage		100.00%
HTH Hillcrest Project LLC
Basis of Presentation
Membership ownership percentage		100.00%
Hilltop Investments I, LLC
Basis of Presentation
Membership ownership percentage		100.00%
PCC \| Plains Capital Bank
Basis of Presentation
Ownership percentage		100.00%
PCC \| Hilltop Opportunity Partners LLC
Basis of Presentation
Membership ownership percentage		100.00%
PCC \| PCC Statutory Trusts
Basis of Presentation
Ownership percentage		100.00%
Redemption of junior subordinated debentures	$ 67,000
Plains Capital Bank \| Prime Lending
Basis of Presentation
Ownership percentage		100.00%
Prime Lending \| Prime Lending Ventures Management LLC
Basis of Presentation
Membership ownership percentage		100.00%
Hilltop Investments I, LLC \| Hillcrest Land LLC
Basis of Presentation
Membership ownership percentage		50.00%