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v3.10.0.1

Subsequent Event (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Subsequent Event [Abstract] |
Potential loss resulting from customer bankruptcy | $ 11

X
- Definition Potential Loss Resulting From Customer Bankruptcy + References No definition available. + Details
Name: | hbhc_PotentialLossResultingFromCustomerBankruptcy
Namespace Prefix: | hbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SubsequentEventsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration