Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Interest that would have been recorded on nonaccrual loans	$ 800,000
Interest recorded on nonaccrual loans	300,000hbhc_InterestRecoveredOnNonaccrualLoans
Nonaccrual loans	90,821,000	79,537,000
Troubled debt restructuring both accruing and nonaccruing	12,500,000	16,000,000
Minimum bank portfolio loan need to be reviewed	1,000,000
Real estate acquired through foreclosure	41,701,000	58,415,000
Consumer [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Nonaccrual loans	5,492,000	5,748,000
Mortgage loan in process of foreclosure	10,100,000	13,700,000
Real estate acquired through foreclosure	12,400,000	12,700,000
Performing [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Period for which payments of principal and interest are past due	Less than 90 days
Troubled Debt Restructurings [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Nonaccrual loans	5,000,000	7,000,000
FDIC Acquired Loans [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Nonaccrual loans	1,589,000	2,102,000
FDIC Acquired Loans [Member] \| Consumer [Member]
Non Accrual Loans Segregated By Class Of Loans [Line Items]
Nonaccrual loans		174,000
Mortgage loan in process of foreclosure	6,000,000	8,100,000
Real estate acquired through foreclosure	$ 7,100,000	$ 8,200,000

Interest received on nonaccrual loans

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- Definition

Minimum Bank portfolio loan need to be reviewed.

+ References

No definition available.

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- Definition

Mortgage Loans In Process Of Foreclosure

+ References

No definition available.

+ Details

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- Definition

Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 29

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953659-111524

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 30

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- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

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- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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- Definition

For a debtor, the gain (loss) recognized on the transfer of assets, after the impact of income tax expense or benefit, arising from the difference between the book value of the assets transferred before the restructuring and the fair value of the assets transferred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 60

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15743-112638

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