Other Noninterest Income - Components of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Noninterest Income [Abstract]
Income from bank owned life insurance	$ 2,666hbhc_IncomeFromBankOwnedLifeInsurance	$ 2,314hbhc_IncomeFromBankOwnedLifeInsurance
Credit related fees	2,457hbhc_LetterOfCreditFees	2,732hbhc_LetterOfCreditFees
(Loss) income from derivatives	(52)	759
Net gain on sale of assets	7	1,682
Safety deposit box income	486hbhc_SafetyDepositBoxIncome	513hbhc_SafetyDepositBoxIncome
Other miscellaneous	2,680	2,427
Total other noninterest income	$ 8,244us-gaap_NoninterestIncomeOther	$ 10,427us-gaap_NoninterestIncomeOther

Income from bank owned life insurance.

No definition available.

Name:	hbhc_IncomeFromBankOwnedLifeInsurance
Namespace Prefix:	hbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Letter of credit fees.

+ References

No definition available.

+ Details

Name:	hbhc_LetterOfCreditFees
Namespace Prefix:	hbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Other income within other noninterest income.

+ References

No definition available.

+ Details

Name:	hbhc_OtherIncomeWithinOtherNoninterestIncome
Namespace Prefix:	hbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Safety deposit box income.

+ References

No definition available.

+ Details

Name:	hbhc_SafetyDepositBoxIncome
Namespace Prefix:	hbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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

- Details

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

- Definition

Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

+ 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_NoninterestIncomeOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3505-108585

+ Details

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