Name:	bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesAvailableForSaleSecuritiesFairValueDisclosure
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_GovernmentAgencyIssuedResidentialMortgageBackedSecuritiesAvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
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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
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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
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Percentage rate deduction from the fair value of other real estate determined by independent party.

No definition available.

Name:	bxs_PercentageRateDeductionToDetermineFairValueOfOtherRealEstateOwned
Namespace Prefix:	bxs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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
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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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Period Type:	instant

- Details

Name:	us-gaap_AvailableForSaleSecuritiesAbstract
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Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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Name:	us-gaap_DerivativeAssets
Namespace Prefix:	us-gaap_
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Period Type:	instant

Fair value, after the 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 assets not subject to a master netting arrangement and not elected to be offset.

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

No definition available.

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

No definition available.

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

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

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