Loans - Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans (Parenthetical) (Detail) (USD $) In Billions, unless otherwise specified	Dec. 31, 2014
Receivables [Abstract]
Originated loans previously reported as acquired-performing	$ 1.2

Originated loans that were previously reported as acquired-performing.

No definition available.

Name:	hbhc_OriginatedLoansPreviouslyReportedAsAcquiredperforming
Namespace Prefix:	hbhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant