Name:	bxs_GovernmentAgencyIssuedCommercialMortgage-BackedSecuritiesAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for Government agency issued residential mortgage-backed available-for-sale securities.

No definition available.

Name:	bxs_GovernmentAgencyIssuedResidentialMortgage-BackedSecuritiesAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for impaired loans.

No definition available.

Name:	bxs_ImpairedLoansFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for obligations of states and political subdivisions available-for-sale securities.

No definition available.

Name:	bxs_ObligationsOfStatesAndPoliticalSubdivisionsAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for other available-for-sale securities, not otherwise specified.

No definition available.

Name:	bxs_OtherAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for other real estate owned.

No definition available.

Name:	bxs_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the portion of the balance sheet assertion valued at fair value by the entity for U.S. Government agencies available-for-sale securities.

No definition available.

Name:	bxs_UsGovernmentAgenciesAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
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Period Type:	duration

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Name:	us-gaap_AvailableForSaleSecuritiesAbstract
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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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Name:	us-gaap_DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

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Name:	us-gaap_LiabilitiesFairValueDisclosureAbstract
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Period Type:	duration

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

No definition available.

Name:	us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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