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SECURITIES (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 2,152,994,000us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 2,408,312,000us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 2,124,567,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains 42,551,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 33,790,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 38,496,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses 1,172,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 15,344,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax 6,136,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value 2,194,373,000us-gaap_AvailableForSaleSecurities 2,426,758,000us-gaap_AvailableForSaleSecurities 2,156,927,000us-gaap_AvailableForSaleSecurities [1]
Gross gains recognized on available-for-sale securities 14,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 4,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Gross losses recognized on available-for-sale securities   8,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities  
Available-for-sale securities, amortized cost, by contractual maturity [Abstract]      
Maturing in one year or less 358,231,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost    
Maturing after one year through five years 1,042,374,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost    
Maturing after five years through ten years 50,915,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost    
Maturing after ten years 279,384,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost    
Mortgage-backed securities 422,090,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis    
Total 2,152,994,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost    
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Maturing in one year or less 360,900,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue    
Maturing after one year through five years 1,048,727,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue    
Maturing after five years through ten years 52,965,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue    
Maturing after ten years 303,991,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue    
Mortgage-backed securities 427,790,000us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure    
Estimated Fair Value 2,194,373,000us-gaap_AvailableForSaleSecurities 2,426,758,000us-gaap_AvailableForSaleSecurities 2,156,927,000us-gaap_AvailableForSaleSecurities [1]
Available-for-sale securities, weighted average yield, by contractual maturity [Abstract]      
Maturing in one year or less (in hundredths) 1.67%bxs_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearWeightedAverageYield    
Maturing after one year through five years (in hundredths) 1.22%bxs_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsWeightedAverageYield    
Maturing after five years through ten years (in hundredths) 4.90%bxs_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsWeightedAverageYield    
Maturing after ten years (in hundredths) 6.00%bxs_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsWeightedAverageYield    
Mortgage-backed securities (in hundredths) 2.08%bxs_MortgageBackedSecuritiesWeightedAverageYield    
Available-for-sale securities with continuous unrealized loss positions [Abstract]      
Less Than 12 Months Fair Value 150,742,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue   259,030,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Less Than 12 Months Unrealized Losses 332,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses   557,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
12 Months or Longer Fair Value 117,975,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue   522,344,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
12 Months or Longer Unrealized Losses 840,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses   5,579,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Total Fair Value Available-for-sale Securities 268,717,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue   781,374,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Total Unrealized Losses Available-for-sale Securities 1,172,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses   6,136,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
US Government Agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 1,280,055,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,416,273,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,213,310,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains 6,947,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 7,899,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 4,093,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Losses 21,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 4,903,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 2,349,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value 1,286,981,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,419,269,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,215,054,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Estimated Fair Value 1,286,981,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,419,269,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 1,215,054,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Available-for-sale securities with continuous unrealized loss positions [Abstract]      
Less Than 12 Months Fair Value 40,130,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   237,891,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Less Than 12 Months Unrealized Losses 13,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   471,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
12 Months or Longer Fair Value 9,961,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   283,643,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
12 Months or Longer Unrealized Losses 8,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   1,878,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total Fair Value Available-for-sale Securities 50,091,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   521,534,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Total Unrealized Losses Available-for-sale Securities 21,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		   2,349,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Government Agency Issued Residential Mortgage-Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 196,712,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 238,887,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 204,918,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Gross Unrealized Gains 3,897,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 3,898,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 4,751,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Gross Unrealized Losses 228,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 1,189,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 439,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Estimated Fair Value 200,381,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 241,596,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 209,230,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Estimated Fair Value 200,381,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 241,596,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		 209,230,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available-for-sale securities with continuous unrealized loss positions [Abstract]      
Less Than 12 Months Fair Value 5,402,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
Less Than 12 Months Unrealized Losses 30,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		    
12 Months or Longer Fair Value 23,555,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		   24,565,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12 Months or Longer Unrealized Losses 198,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		   439,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total Fair Value Available-for-sale Securities 28,957,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		   24,565,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total Unrealized Losses Available-for-sale Securities 228,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		   439,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Government Agency Issued Commercial Mortgage-Backed Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 225,378,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 240,619,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 241,449,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Gross Unrealized Gains 2,887,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 1,866,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 2,319,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Gross Unrealized Losses 856,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 8,426,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 3,200,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Estimated Fair Value 227,409,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 234,059,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 240,568,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Estimated Fair Value 227,409,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 234,059,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		 240,568,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Available-for-sale securities with continuous unrealized loss positions [Abstract]      
Less Than 12 Months Fair Value 93,708,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   3,822,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Less Than 12 Months Unrealized Losses 252,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   24,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
12 Months or Longer Fair Value 80,341,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   203,520,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
12 Months or Longer Unrealized Losses 604,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   3,176,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Total Fair Value Available-for-sale Securities 174,049,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   207,342,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Total Unrealized Losses Available-for-sale Securities 856,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember		   3,200,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_GovernmentAgencyIssuedCommercialMortgageBackedSecuritiesMember
Obligations Of States And Political Subdivisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 444,059,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 505,586,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 458,026,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Gains 27,547,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 19,051,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 25,986,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Gross Unrealized Losses 67,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 826,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 148,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Estimated Fair Value 471,539,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 523,811,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 483,864,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Estimated Fair Value 471,539,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 523,811,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		 483,864,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Available-for-sale securities with continuous unrealized loss positions [Abstract]      
Less Than 12 Months Fair Value 11,502,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   17,317,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Less Than 12 Months Unrealized Losses 37,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   62,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
12 Months or Longer Fair Value 4,118,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   10,616,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
12 Months or Longer Unrealized Losses 30,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   86,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total Fair Value Available-for-sale Securities 15,620,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   27,933,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total Unrealized Losses Available-for-sale Securities 67,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember		   148,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Other [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 6,790,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 6,947,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 6,864,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember
Gross Unrealized Gains 1,273,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 1,076,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 1,347,000bxs_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember
Estimated Fair Value 8,063,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 8,023,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 8,211,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember
Available-for-sale securities, estimated fair value, by contractual maturity [Abstract]      
Estimated Fair Value $ 8,063,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 $ 8,023,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember		 $ 8,211,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bxs_OtherAvailableForSaleSecuritiesMember
[1] Derived from audited financial statements.See accompanying notes to consolidated financial statements.