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Subsequent Event (Details) - USD ($) $ in Thousands | Apr. 28, 2017 | Mar. 10, 2017
--- | --- | ---
Subsequent Event [Line Items] |  |
Acquisition, assets assumed |  | $ 1,233,643
Whitney Bank [Member] | Subsequent Event [Member] |  |
Subsequent Event [Line Items] |  |
Acquisition, cash | $ 655,000 |
Transaction premium | 35,000 |
Whitney Bank [Member] | Subsequent Event [Member] | Deposits [Member] |  |
Subsequent Event [Line Items] |  |
Acquisition, assets assumed | 1,600,000 |
Whitney Bank [Member] | Subsequent Event [Member] | Cash, Securities, Consumer And Residential Mortgage Loans [Member] |  |
Subsequent Event [Line Items] |  |
Acquisition, assets assumed | $ 1,000,000 |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash + References No definition available. + Details
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Namespace Prefix: | hbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Business Combination Transaction Premium + References No definition available. + Details
Name: | hbhc_BusinessCombinationTransactionPremium
Namespace Prefix: | hbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |