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

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 recorded liability of the entity upon completion of merger.

+ References

No definition available.

+ Details

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

- 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

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/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 9

+ 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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Details

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

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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

Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Nov. 30, 2012 item	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2001
Employee Benefits
Matching contributions		$ 8.8	$ 7.5	$ 0.7
Liability recorded		8.9
Number of executive officers of PlainsCapital with retention agreements	2
Flexible premium universal life insurance
Amount of insurance purchased					15.0hth_BankOwnedLifeInsurancePurchased
Carrying value of the policies		24.8us-gaap_BankOwnedLifeInsurance	24.5us-gaap_BankOwnedLifeInsurance
Income related to the policies		$ 0.4us-gaap_BankOwnedLifeInsuranceIncome	$ 0.4us-gaap_BankOwnedLifeInsuranceIncome	$ 0.1us-gaap_BankOwnedLifeInsuranceIncome