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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
loan
item
Dec. 31, 2013
loan
Dec. 31, 2012
loan
Cash Flow Statements [Abstract]      
Paid interest $ 35,000,000us-gaap_InterestPaid $ 51,900,000us-gaap_InterestPaid $ 74,300,000us-gaap_InterestPaid
Income taxes paid 50,700,000us-gaap_IncomeTaxesPaidNet 39,500,000us-gaap_IncomeTaxesPaidNet 28,100,000us-gaap_IncomeTaxesPaidNet
Unsettled purchases of securities 10,000,000bxs_UnsettledPurchasesOfSecurities 1,200,000bxs_UnsettledPurchasesOfSecurities 24,900,000bxs_UnsettledPurchasesOfSecurities
Loans foreclosed and transferred to OREO 14,700,000us-gaap_TransferToOtherRealEstate 29,300,000us-gaap_TransferToOtherRealEstate 32,400,000us-gaap_TransferToOtherRealEstate
Mortgage Loan Related to Property Sales 4,400,000us-gaap_MortgageLoanRelatedToPropertySales1 13,700,000us-gaap_MortgageLoanRelatedToPropertySales1 3,700,000us-gaap_MortgageLoanRelatedToPropertySales1
Loans and Leases [Abstract]      
Threshold loan amount for which a new appraisal is ordered, when characteristics of potential impairment exist 500,000bxs_ThresholdLoanAmountForWhichNewAppraisalIsOrderedWhenCharacteristicsOfPotentialImpairmentExist    
Threshold loan amount for which an appraisal is obtained for real estate collateral 250,000bxs_ThresholdLoanAmountForWhichAppraisalIsObtainedForRealEstateCollateral    
Period over which an appraisal is considered current 12 months    
Impaired loans 28,101,000us-gaap_ImpairedFinancingReceivableRecordedInvestment 54,943,000us-gaap_ImpairedFinancingReceivableRecordedInvestment  
Cumulative charge-offs during the period 25,000,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs 42,200,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs 89,400,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Specific reserves included in the allowance for credit losses 1,500,000bxs_SpecificReservesIncludedInAllowanceForCreditLosses    
Days past due of principal or interest at which loans and leases may be placed in non-accrual status 90 days    
Minimum sustained period of repayment performance for TDR loans to return to accrual status 6 months    
Loans held for sale [Abstract]      
Number of mortgage loans repurchased 21bxs_NumberOfMortgageLoansRepurchased 16bxs_NumberOfMortgageLoansRepurchased 14bxs_NumberOfMortgageLoansRepurchased
Amount of mortgage loans repurchased 2,300,000bxs_AmountOfMortgageLoansRepurchased 931,000bxs_AmountOfMortgageLoansRepurchased 2,100,000bxs_AmountOfMortgageLoansRepurchased
Losses recognized related to repurchased and make whole loans 913,000bxs_LossesRecognizedRelatedToRepurchasedAndMakeWholeLoans 661,000bxs_LossesRecognizedRelatedToRepurchasedAndMakeWholeLoans 782,000bxs_LossesRecognizedRelatedToRepurchasedAndMakeWholeLoans
Amount reserved for potential losses from representation and warranty obligations 1,100,000bxs_AmountReservedForPotentialLossesFromRepresentationAndWarrantyObligations    
Percentage of remaining principal balance of delinquent loans that may be repurchased by the servicer (in hundredths) 100.00%bxs_PercentageOfRemainingPrincipalBalanceOfDelinquentLoansThatMayBeRepurchasedByServicer    
Amount of loans subject to buy back 23,500,000bxs_AmountOfLoansSubjectToBuyBack    
Derivative Instruments [Abstract]      
Notional amount 324,200,000invest_DerivativeNotionalAmount 412,900,000invest_DerivativeNotionalAmount  
Average maturity 49 months 15 days 54 months 21 days  
Average interest receive rate (in hundredths) 2.50%us-gaap_DerivativeAverageFixedInterestRate 2.50%us-gaap_DerivativeAverageFixedInterestRate  
Average interest pay rate (in hundredths) 5.60%us-gaap_DerivativeAverageVariableInterestRate 5.60%us-gaap_DerivativeAverageVariableInterestRate  
Stock-Based Compensation [Abstract]      
Number of stock-based employee compensation plans 3bxs_NumberOfStockBasedEmployeeCompensationPlans    
Compensation costs for unvested awards granted 843,000us-gaap_AllocatedShareBasedCompensationExpense    
Impaired Loans [Member]      
Loans and Leases [Abstract]      
Cumulative charge-offs during the period $ 5,500,000us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bxs_ImpairedLoansMember		    
Minimum [Member]      
Loans and Leases [Abstract]      
Marketing period 180 days    
Maximum [Member]      
Loans and Leases [Abstract]      
Marketing period 360 days    
Basic Plan [Member]      
Pension and Postretirement Benefits Accounting [Abstract]      
Discount rate assumptions for determination of projected benefit obligation (in hundredths) 4.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		 4.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember		  
Restoration Plan [Member]      
Pension and Postretirement Benefits Accounting [Abstract]      
Discount rate assumptions for determination of projected benefit obligation (in hundredths) 3.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember		 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember		  
Supplemental Plan [Member]      
Pension and Postretirement Benefits Accounting [Abstract]      
Discount rate assumptions for determination of projected benefit obligation (in hundredths) 3.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 3.65%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember