Represents the amount of net capital as a percentage of aggregate debit items maintained by the entity.

No definition available.

Name:	hth_NetCapitalMaintainedAsPercentageOfAggregateDebitItems
Namespace Prefix:	hth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Amount of net capital in excess of minimum required net capital, calculated under Alternative Standard.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_AlternativeExcessNetCapital
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Minimum amount of net capital of broker-dealer and its subsidiary, calculated under Alternative Standard.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_AlternativeNetCapitalRequirement1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of net capital of broker-dealer.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Amount of net capital calculated under Alternative Standard in excess of five percent of debit items.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

Name:	srt_NetCapitalInExcessOfFivePercentOfDebitItems
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No definition available.

Name:	srt_RegulatoryCapitalRequirementsAbstract
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Cash and securities deposited in a special reserve account for the exclusive benefit of customers.

No definition available.

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

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

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

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

Regulatory Matters - Net Capital Position, Broker-Dealers (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Net Capital
Amount required to be segregated in cash and securities for the benefit of customers	$ 194,626	$ 157,436	$ 151,271
Hilltop Securities
Net Capital
Net capital	281,682
Less required net capital	8,241
Excess net capital	$ 273,441
Net capital as a percentage of aggregate debit items	68.40%
Net capital in excess of 5% aggregate debt items	$ 261,080
HTS Independent Network
Net Capital
Net capital	3,019
Less required net capital	250
Excess net capital	2,769
Hilltop Broker-Dealers
Net Capital
Amount required to be segregated in cash and securities for the benefit of customers	$ 194,600	$ 157,400