Name:	hth_BusinessCombinationContingentConsiderationArrangementsPaymentAccrualAmount
Namespace Prefix:	hth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the period following the acquisition in which the actual losses incurred under the agreement are measured against the stated threshold which could result in additional consideration being paid by the acquirer if the threshold is not met.

No definition available.

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

Represents the period of loss recovery provisions in effect for covered loans.

No definition available.

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

Represents the period of loss-sharing agreements in effect for covered loans.

No definition available.

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

Represents the net percentage of losses to be absorbed by the Federal Deposit Insurance Corporation, on the first layer amount of losses incurred, as per the loss sharing agreement.

No definition available.

Name:	hth_BusinessCombinationPercentageOfNetLossesIncurredToBeAbsorbedByFdicFirstLayer
Namespace Prefix:	hth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of net losses to be absorbed by the Federal Deposit Insurance Corporation, on the second layer amount of net losses incurred, as per the loss sharing agreement.

No definition available.

Name:	hth_BusinessCombinationPercentageOfNetLossesIncurredToBeAbsorbedByFdicSecondLayer
Namespace Prefix:	hth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of net losses to be absorbed by the Federal Deposit Insurance Corporation, on the third layer amount of net losses incurred, as per the loss sharing agreement.

No definition available.

Name:	hth_BusinessCombinationPercentageOfNetLossesIncurredToBeAbsorbedByFdicThirdLayer
Namespace Prefix:	hth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the first layer threshold amount of net losses incurred, for a specified percentage of net losses to be absorbed by the Federal Deposit Insurance Corporation, as per the loss sharing agreement.

No definition available.

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

Represents the second layer threshold amount of net losses incurred for a specified percentage of net losses, to be absorbed by the Federal Deposit Insurance Corporation, as per the loss sharing agreement.

No definition available.

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

Represents the threshold limit of the amount of subsequent recoveries that are reimbursable to the FDIC under the loss share agreement for single family residential assets.

No definition available.

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

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.

No definition available.

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

Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

No definition available.

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

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

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_TypeOfArrangementAxis=hth_TerminationAgreementWithFDICMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_BusinessAcquisitionAxis=hth_FirstNationalBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	hth_ReceivableByIndemnificationStatusAxis=hth_CoveredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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