Summary of Significant Accounting and Reporting Policies - Basis of Presentation - Loans (Details)	12 Months Ended
Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)
Insurance Premiums Receivable
Valuation allowance for uncollectible amounts	$ 0	$ 0
Deferred Policy Acquisition Costs.
Premium deficiency	$ 0	$ 0
Minimum
Loans Held for Sale
Number of layers of common risk characteristics based on which certain acquired loans aggregated into various loan pools to determine respective fair values \| item	2
Maximum
Loans Held for Sale
Loans held-for-sale, period reported on balance sheet	30 days
Acquired loans
Loans Held for Sale
Carryover of Allowance for Loan and Lease Losses, Loans Acquired	$ 0

Represents the carryover of the reserve for bad debts arising from purchase of loan and lease portfolios.

No definition available.

Name:	hth_CarryoverOfAllowanceForLoanAndLeaseLossesLoansAcquired
Namespace Prefix:	hth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of premium deficiency of deferred policy acquisition costs recorded when the sum of the expected loss and loss adjustment expenses, unamortized policy acquisition costs, and maintenance costs exceeds related unearned insurance premiums and anticipated investment income.

+ References

No definition available.

+ Details

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

- Definition

Represents the period of time a loan held-for-sale is reported on the balance sheet.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of layers of common risk characteristics based on which certain acquired loans aggregated into various loan pools for the purpose of determining their respective fair values.

+ References

No definition available.

+ Details

Name:	hth_NumberOfLayersOfCommonRiskCharacteristicsBasedOnWhichAcquiredLoansAggregatedIntoLoanPoolsToDetermineFairValues
Namespace Prefix:	hth_
Data Type:	xbrli:integerItemType
Balance Type:	na
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.5)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 5
-Article 7

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

+ Details

Name:	us-gaap_PremiumsReceivableAllowanceForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=hth_AcquiredFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: