Appraisal on file period to determine if reserve is required on residential loans.

No definition available.

Name:	hth_AppraisalOnFilePeriodToDetermineIfReserveRequired
Namespace Prefix:	hth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of business units of the entity.

+ References

No definition available.

+ Details

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

- Definition

Delinquent period before consumer loans are charged off.

+ References

No definition available.

+ Details

Name:	hth_PeriodDelinquentConsumerLoansWrittenOff
Namespace Prefix:	hth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents line items for significant accounting policies table.

+ References

No definition available.

+ Details

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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 http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Summary of Significant Accounting and Reporting Policies - Basis of Presentation, Ownership (Details) $ in Millions		3 Months Ended
	Jan. 30, 2020 USD ($)	Mar. 31, 2020 item
Basis of Presentation
Number of primary business units \| item		3
Appraisal on file period to determine if reserve is required on 1-4 family residential loans		2 years
Period Delinquent Consumer Loans Written Off		90 days
PPC
Basis of Presentation
Ownership percentage		100.00%
Securities Holdings
Basis of Presentation
Ownership percentage		100.00%
NLC
Basis of Presentation
Aggregate purchase price, cash \| $	$ 150.0
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%
PPC \| PlainsCapital (the Bank)
Basis of Presentation
Ownership percentage		100.00%
PPC \| Hilltop Opportunity Partners LLC
Basis of Presentation
Membership ownership percentage		100.00%
PPC \| PCC Statutory Trusts
Basis of Presentation
Ownership percentage		100.00%
PlainsCapital (the Bank) \| Prime Lending
Basis of Presentation
Ownership percentage		100.00%
Prime Lending \| Ventures Management
Basis of Presentation
Membership ownership percentage		100.00%
Hilltop Investments I, LLC \| Hillcrest Land LLC
Basis of Presentation
Membership ownership percentage		50.00%