No definition available.

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

- Definition

Represents the amount of insurance purchased by the Bank.

+ References

No definition available.

+ Details

Name:	hth_BankOwnedLifeInsurancePurchased
Namespace Prefix:	hth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the vesting period of the deferred compensation arrangements

+ References

No definition available.

+ Details

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

- Definition

The amount of participant discount in a defined contribution plan.

+ References

No definition available.

+ Details

Name:	hth_DefinedContributionPlanParticipantDiscount
Namespace Prefix:	hth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the number of executive officers with whom retention agreement was entered into.

+ References

No definition available.

+ Details

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

- Definition

Represents information pertaining to percentage of shares to be purchased at fair market value.

+ References

No definition available.

+ Details

Name:	hth_PercentageOfSharesToBePurchasedAtFairMarketValue
Namespace Prefix:	hth_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of the defined contribution plan liability, including interest.

+ References

No definition available.

+ Details

Name:	hth_SeparationRetentionAgreementLiabilityIncludingInterest
Namespace Prefix:	hth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

Name:	us-gaap_BankOwnedLifeInsurance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_BankOwnedLifeInsuranceIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanNameAxis=hth_DeferredCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Employee Benefits (Details) $ in Millions			1 Months Ended	12 Months Ended
Employee Benefits (Details) $ in Millions	Jan. 01, 2015	Nov. 30, 2012 item	Jul. 31, 2020	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2001 USD ($)
Employee Benefits
Matching contributions				$ 13.3	$ 10.4	$ 15.9
Operating expense relating to participated discount				0.4	0.6	0.8
Number of executive officers of PlainsCapital with retention agreements \| item		2
Liability, including interest					2.7
Flexible premium universal life insurance
Amount of insurance purchased							$ 15.0
Carrying value of the policies				29.0	28.6
Income related to the policies				$ 0.6	$ 0.5	$ 0.5
Employee Stock
Employee Benefits
Percentage of shares to be purchased at fair market value			90.00%
SWS Plan
Employee Benefits
Deferred compensation plan, matching percentage	15.00%
Deferred compensation plan, vesting period	4 years