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Other Noninterest Income and Other Noninterest Expense - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nonoperating expense [Line Items]        
Other miscellaneous expenses   $ 30,585,000us-gaap_OtherNonoperatingExpense $ 45,242,000us-gaap_OtherNonoperatingExpense $ 27,669,000us-gaap_OtherNonoperatingExpense
Expense related to the settlement of the assessment with the FDIC 10,300,000us-gaap_FDICIndemnificationAssetNetWriteOffs      
Gain on Sale of Insurance Business   9,400,000us-gaap_GainsLossesOnSalesOfAssets    
Sales price of divested business   15,500,000hbhc_SalesPriceOfDivestedBusiness    
Early termination fee of reverse repurchase obligations 3,500,000hbhc_ReverseRepurchaseAgreementEarlyTerminationFee      
Other Miscellaneous Expense [Member]        
Nonoperating expense [Line Items]        
Other miscellaneous expenses   9,600,000us-gaap_OtherNonoperatingExpense
/ us-gaap_NatureOfExpenseAxis
= hbhc_MiscellaneousExpenseMember
19,700,000us-gaap_OtherNonoperatingExpense
/ us-gaap_NatureOfExpenseAxis
= hbhc_MiscellaneousExpenseMember
3,200,000us-gaap_OtherNonoperatingExpense
/ us-gaap_NatureOfExpenseAxis
= hbhc_MiscellaneousExpenseMember
Branch Closures [Member]        
Nonoperating expense [Line Items]        
Expense related to closure of branches   $ 4,600,000us-gaap_BusinessExitCosts1
/ invest_InvestmentAxis
= hbhc_BranchClosuresMember
   
Number of branch locations   15hbhc_NumberOfBranchesClosed
/ invest_InvestmentAxis
= hbhc_BranchClosuresMember