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LOANS AND LEASES (Loan And Lease Portfolio, Net Of Unearned Income, By Segment, Class And Internally Assigned Grade) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total $ 9,726,970us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 9,712,936us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 9,405,059us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 9,366,126us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 961us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 978us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 294,916us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 316,722us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,197us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 1,009us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 24,837us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 28,101us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Commercial And Industrial [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,676,366us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,746,486us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial And Industrial [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,642,264us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,709,475us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial And Industrial [Member] | Special Mention [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 961us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 978us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial And Industrial [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 31,202us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 33,879us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial And Industrial [Member] | Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 99us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Commercial And Industrial [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,840us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 2,154us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Real Estate [Member] | Consumer Mortgages [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 2,301,112us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 2,257,726us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Consumer Mortgages [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 2,218,792us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 2,167,965us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Consumer Mortgages [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 78,928us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 84,975us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Consumer Mortgages [Member] | Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 227us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		  
Real Estate [Member] | Consumer Mortgages [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 3,165us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 4,786us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Home Equity [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 538,042us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 531,374us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Home Equity [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 527,726us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 521,011us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Home Equity [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 9,706us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 9,744us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Home Equity [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 610us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 619us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Agricultural [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 236,898us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 239,616us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Agricultural [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 225,990us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 227,688us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Agricultural [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 10,908us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 11,928us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_AgriculturalRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,518,153us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 1,522,536us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,457,229us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 1,450,158us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 54,801us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 64,420us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 242us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 491us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial And Industrial - Owner Occupied [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 5,881us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 7,467us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialAndIndustrialOwnerOccupiedRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Construction, Acquisition And Development [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 892,730us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 853,623us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Construction, Acquisition And Development [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 851,938us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 811,227us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Construction, Acquisition And Development [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 37,303us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 39,675us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Construction, Acquisition And Development [Member] | Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 329us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 334us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Construction, Acquisition And Development [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 3,160us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 2,387us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial Real Estate [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,993,473us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 1,961,977us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial Real Estate [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 1,923,659us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 1,893,514us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 59,497us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 57,761us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial Real Estate [Member] | Doubtful [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 300us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 184us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Real Estate [Member] | Commercial Real Estate [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 10,017us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember		 10,518us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bxs_CommercialRealEstateFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= bxs_RealEstateSegmentMember
Credit Cards [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 106,287us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember		 113,426us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
Credit Cards [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 106,287us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember		 113,426us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_ConsumerPortfolioSegmentMember
All Other [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 463,909us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember		 486,172us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember
All Other [Member] | Pass [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 451,174us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember		 471,662us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember
All Other [Member] | Substandard [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total 12,571us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember		 14,340us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember
All Other [Member] | Impaired [Member]    
Loan and lease portfolio, net of unearned income, by grade [Abstract]    
Total $ 164us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember		 $ 170us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ bxs_PortfolioSegmentsAxis
= us-gaap_UnallocatedFinancingReceivablesMember