Derivatives - Offsetting Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts Recognized	$ 18,627	$ 13,779
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial	18,627	13,779
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	936	3,462
Gross Amounts Not offset in the Statement of Financial Position - Cash Collateral	17,343	7,406
Net Amount	348	2,911
Gross Amounts Recognized	17,931	14,149
Gross Amounts Offset in the Statement of Financial Position	0hbhc_DerivativeAssetFairValueGrossAsset	0hbhc_DerivativeAssetFairValueGrossAsset
Net Amounts Presented in the Statement of Financial	17,931	14,149
Gross Amounts Not Offset in the Statement of Financial Position - Financial Instruments	936	3,462
Gross Amounts Not offset in the Statement of Financial Position - Cash Collateral	0	0
Net Amount	$ 16,995	$ 10,687

Derivative Asset Fair Value Gross Asset

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Financial and Derivative Liability Amount Offset Net

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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