No definition available.

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

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

+ Details

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

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

+ Details

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

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

+ Details

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

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

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

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: 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=66008989&loc=d3e5074-111524

+ Details

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

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ 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 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

+ Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hth_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hth_RealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hth_ConstructionAndLandDevelopmentPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Covered Assets and Indemnification Asset - Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2016
Changes in the allowance for loan losses
Balance, beginning of period			$ 54,186
Provision charged to (recapture from) operations	$ 1,260	$ 3,990	8,818	$ 36,273
Balance, end of period	58,779		58,779
Loan portfolio distributed by portfolio segment and impairment methodology
Total loans					$ 6,148,813	$ 5,843,499
Allowance for loan losses distributed by portfolio segment and impairment methodology
Total loans, allowance	58,779		54,186		58,779	54,186
Covered
Changes in the allowance for loan losses
Balance, beginning of period	1,359	1,455	413	1,532
Provision charged to (recapture from) operations	781	(729)	2,237	(825)
Loans charged off			(527)	(99)
Recoveries on charged off loans	1	3	18	121
Balance, end of period	2,141	729	2,141	729
Loan portfolio distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment					99,827	122,373
Total loans					190,410	256,127
Allowance for loan losses distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment, allowance					33	69
Total loans, allowance	1,359	1,455	413	1,532	2,141	413
Covered \| Commercial and industrial
Changes in the allowance for loan losses
Balance, beginning of period	47	55	35	758
Provision charged to (recapture from) operations	34	162	46	(535)
Loans charged off			(6)	(6)
Recoveries on charged off loans			6
Balance, end of period	81	217	81	217
Loan portfolio distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment					961	1,185
Total loans					1,242	2,697
Allowance for loan losses distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment, allowance					6	22
Total loans, allowance	47	55	35	758	81	35
Covered \| Real estate
Changes in the allowance for loan losses
Balance, beginning of period	684	1,400	378	774
Provision charged to (recapture from) operations	1,093	(888)	1,915	(237)
Loans charged off			(521)	(42)
Recoveries on charged off loans			5	17
Balance, end of period	1,777	512	1,777	512
Loan portfolio distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment					96,761	117,431
Total loans					186,777	244,469
Allowance for loan losses distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment, allowance					25	47
Total loans, allowance	684	1,400	378	774	1,777	378
Covered \| Construction and land development
Changes in the allowance for loan losses
Balance, beginning of period	628
Provision charged to (recapture from) operations	(346)	(3)	276	(53)
Loans charged off				(51)
Recoveries on charged off loans	1	$ 3	7	$ 104
Balance, end of period	283		283
Loan portfolio distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment					2,105	3,757
Total loans					2,391	8,961
Allowance for loan losses distributed by portfolio segment and impairment methodology
Loans collectively evaluated for impairment, allowance					2
Total loans, allowance	628		283		283
Covered \| PCI loans
Changes in the allowance for loan losses
Balance, beginning of period			344
Balance, end of period	2,108		2,108
Loan portfolio distributed by portfolio segment and impairment methodology
Total loans					90,583	133,754
Allowance for loan losses distributed by portfolio segment and impairment methodology
Total loans, allowance	2,108		344		2,108	344
Covered \| PCI loans \| Commercial and industrial
Changes in the allowance for loan losses
Balance, beginning of period			13
Balance, end of period	75		75
Loan portfolio distributed by portfolio segment and impairment methodology
Total loans					281	1,512
Allowance for loan losses distributed by portfolio segment and impairment methodology
Total loans, allowance	75		13		75	13
Covered \| PCI loans \| Real estate
Changes in the allowance for loan losses
Balance, beginning of period			331
Balance, end of period	1,752		1,752
Loan portfolio distributed by portfolio segment and impairment methodology
Total loans					90,016	127,038
Allowance for loan losses distributed by portfolio segment and impairment methodology
Total loans, allowance	1,752		331		1,752	331
Covered \| PCI loans \| Construction and land development
Changes in the allowance for loan losses
Balance, end of period	281		281
Loan portfolio distributed by portfolio segment and impairment methodology
Total loans					286	$ 5,204
Allowance for loan losses distributed by portfolio segment and impairment methodology
Total loans, allowance	$ 281		$ 281		$ 281