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STOCK INCENTIVE AND STOCK OPTION PLANS (Details) (USD $)
 0 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2012
Mar. 31, 2011
May 31, 2013
Jun. 30, 2012
May 31, 2012
Dec. 31, 2012
Nov. 30, 2012
Mar. 31, 2013
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Exercisable period of options, minimum (in years)   1 year                      
Exercisable period of options, maximum (in years)   10 years                      
Compensation expense recognized (reversed)   $ 843,000us-gaap_AllocatedShareBasedCompensationExpense                      
Period for recognition of unrecognized expenses (in years)   4 years                      
Contractual life of stock options (in years)   7 years                      
Stock option activity [Roll Forward]                          
Outstanding at beginning of period (in shares) 2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,714,023us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,714,023us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber               2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted (in shares)       (338,681)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod                  
Exercised (in shares)       (6,333)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                  
Cancelled or forfeited (in shares)       (174,183)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod                  
Expired (in shares)       (107,334)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod                  
Outstanding at end of period (in shares) 2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber     2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber           2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber      
Exercisable at end of period (in shares) 2,306,860us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber     2,306,860us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber           2,306,860us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber      
Stock options, additional disclosures [Abstract]                          
Outstanding at beginning of period, Weighted-average exercise price (in dollars per share) $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice   $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 21.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice 21.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice               20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted, Weighted-average exercise price (in dollars per share)       $ 11.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice                  
Exercised, Weighted-average exercise price (in dollars per share)       $ 12.94us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice                  
Cancelled or forfeited, Weighted-average exercise price (in dollars per share)       $ 22.04us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice                  
Expired, Weighted-average exercise price (in dollars per share)       $ 20.03us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice                  
Outstanding at end of period, Weighted-average exercise price (in dollars per share) $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice     $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice           20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice      
Exercisable at end of period, Weighted-average exercise price (in dollars per share) $ 22.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice     $ 22.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice           22.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice      
Outstanding at end of period, Weighted-average remaining contractual term (in years) 3 years 1 month 6 days   2 years 8 months 12 days                    
Exercisable at end of period, Weighted-average remaining contractual term (in years) 2 years 7 months 6 days   2 years 6 months                    
Outstanding at end of period, Weighted-average intrinsic value 1,374,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue   10,806,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue 1,374,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue           1,374,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Exercisable at end of period, Weighted-average intrinsic value 1,332,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1   8,528,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 1,332,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1           1,332,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1      
Assumptions used for stock options [Abstract]                          
Expected volatility (in hundredths)       49.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate                  
Weighted-average volatility (in hundredths)       49.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate                  
Expected dividends (in hundredths)       2.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate                  
Risk-free rate (in hundredths)       0.81%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate                  
Minimum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)   1 year                      
Assumptions used for stock options [Abstract]                          
Expected term (in years)   4 years 9 months 18 days                      
Midpoint [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)   2 years                      
Maximum [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)   3 years                      
Assumptions used for stock options [Abstract]                          
Expected term (in years)   4 years 10 months 24 days                      
1998 Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Minimum percentage of each director's compensation paid in form of the Company's common stock (in hundredths)   50.00%bxs_MinimumPercentageOfEachDirectorsCompensationPaidInFormOfCompanyCommonStock
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_StockIncentivePlan1998Member		                      
Stock Options [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)     1,300,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Total unrecognized compensation cost related to nonvested stock options   22,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Stock option activity [Roll Forward]                          
Outstanding at beginning of period (in shares)   1,884,318us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                   2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted (in shares)     (64,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Exercised (in shares)   (662,721)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (509,236)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Cancelled or forfeited (in shares)   (19,500)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (307,300)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Expired (in shares)   (145,120)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Outstanding at end of period (in shares) 2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1,056,977us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1,884,318us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		           2,764,854us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		      
Exercisable at end of period (in shares)   977,491us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1,715,431us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Stock options, additional disclosures [Abstract]                          
Outstanding at beginning of period, Weighted-average exercise price (in dollars per share)   $ 19.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                   20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Granted, Weighted-average exercise price (in dollars per share)     $ 15.97us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Exercised, Weighted-average exercise price (in dollars per share)   $ 17.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 22.67us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Cancelled or forfeited, Weighted-average exercise price (in dollars per share)   $ 20.26us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 23.60us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Expired, Weighted-average exercise price (in dollars per share)   $ 23.26us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Outstanding at end of period, Weighted-average exercise price (in dollars per share) $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 20.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 19.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		           20.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		      
Exercisable at end of period, Weighted-average exercise price (in dollars per share)   $ 21.38us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Outstanding at end of period, Weighted-average remaining contractual term (in years)   1 year 9 months 18 days                      
Exercisable at end of period, Weighted-average remaining contractual term (in years)   1 year 8 months 12 days                      
Outstanding at end of period, Weighted-average intrinsic value   2,672,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Exercisable at end of period, Weighted-average intrinsic value   1,831,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                      
Additional general disclosures [Abstract]                          
Vesting period, description   These stock options have a contractual life of seven years and vest over a one, two or three-year service period.                      
Assumptions used for stock options [Abstract]                          
Intrinsic value of stock options exercised   4,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 289,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 9,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                  
Stock options outstanding [Abstract]                          
Options Exercisable, Weighted Average Exercise Price (in dollars per share)     $ 20.45us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		                    
Nonvested Options [Member]                          
Stock option activity [Roll Forward]                          
Nonvested, outstanding at beginning of period (in shares)   168,887bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Vested (in shares)   (84,401)bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Cancelled or forfeited (in shares)   (5,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Nonvested, outstanding at end of period (in shares)   79,486bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Stock options, additional disclosures [Abstract]                          
Outstanding at beginning of period, Weighted-average exercise price (in dollars per share)   $ 11.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Vested, Weighted-average exercise price (in dollars per share)   $ 12.81bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Cancelled or forfeited, Weighted-average exercise price (in dollars per share)   $ 11.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Outstanding at end of period, Weighted-average exercise price (in dollars per share)   $ 11.93us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Non-vested options, Weighted-Average grant date fair value [Roll Forward]                          
Outstanding at beginning of period, Weighted-average grant date fair value (in dollars per share)   $ 4.16bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Granted, Weighted-average grant date fair value (in dollars per share)   $ 4.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Vested, Weighted-average grant date fair value (in dollars per share)   $ 4.16bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Forfeited or cancelled, Weighted-average grant date fair value (in dollars per share)   $ 4.15bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Outstanding at end of period, Weighted-average grant date fair value (in dollars per share)   $ 4.16bxs_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= bxs_NonvestedOptionsMember		                      
Performance Shares [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)   500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		                      
Performance Shares [Member] | Long-Term Equity Incentive plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)   3 years                      
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)         103,055us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 125,410us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		              
Terms of award           two-year performance period from January 1, 2011 through December 31, 2012.              
Restricted Stock Units [Member] | Long-Term Equity Incentive plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)   180,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 311,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 199,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		                  
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)             7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		        
Shares of stock covered by award (in shares)             7,500bxs_SharesOfStockCoveredByAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 60,000bxs_SharesOfStockCoveredByAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 7,500bxs_SharesOfStockCoveredByAward
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		        
Period of issuance of restricted stock units               5 years          
Restricted Stock Units [Member] | Long-Term Equity Incentive plan [Member] | Awarded To Directors In 2010, 2012 And 2013 [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)   330,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_AwardedToDirectorsInTwoThousandTenTwoThousandTwelveAndTwoThousandThirteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 140,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_AwardedToDirectorsInTwoThousandTenTwoThousandTwelveAndTwoThousandThirteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 67,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_AwardedToDirectorsInTwoThousandTenTwoThousandTwelveAndTwoThousandThirteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		                  
Restricted Stock Units [Member] | Long-Term Equity Incentive plan [Member] | Shares To Be Issued In 2017 [Member]                          
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)                   24,083us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_SharesToBeIssuedInTwoThousandSeventeenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		      
Restricted Stock [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
bxs_Sharebasedcompensationsharebasedpaymentarrangementsotherthanstockoptionsunrecognizedcostassociatedwithawardsnotyetvested   11,600,000bxs_Bxs_sharebasedcompensationsharebasedpaymentarrangementsotherthanstockoptionsunrecognizedcostassociatedwithawardsnotyetvested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                      
Compensation expense recognized (reversed)   63,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 68,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		                    
Restricted Stock [Member] | Long-Term Equity Incentive plan [Member] | Shares To Be Issued In 2015 [Member]                          
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)                     88,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_SharesToBeIssuedInTwoThousandFifteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		    
Restricted Stock [Member] | Long-Term Equity Incentive plan [Member] | Shares To Be Issued In 2018 [Member]                          
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)                       582,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_SharesToBeIssuedInTwoThousandEighteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		  
Restricted Stock [Member] | Long-Term Equity Incentive plan [Member] | Shares To Be Issued Beginning In March 2014 [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)   160,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_SharesToBeIssuedBeginningInMarchTwoThousandFourteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		                      
Equity instruments other than options [Abstract]                          
Number of awards granted (in shares)                       21,341us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= bxs_SharesToBeIssuedBeginningInMarchTwoThousandFourteenMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		  
Period of issuance of restricted stock units   3 years                      
2011 grant of performance shares [Member] | Long-Term Equity Incentive plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)     193,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bxs_PerformanceShares2011GrantMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 659,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bxs_PerformanceShares2011GrantMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		                  
2012 grant of performance shares [Member] | Long-Term Equity Incentive plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation expense recognized (reversed)   $ 153,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bxs_PerformanceShares2012GrantMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 $ 650,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bxs_PerformanceShares2012GrantMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		 $ 731,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= bxs_PerformanceShares2012GrantMember
/ bxs_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardPlanNameAxis
= bxs_Long-TermEquityIncentivePlanMember		                  
Equity instruments other than options [Abstract]                          
Terms of award         two-year performance period from January 1, 2012 through December 31, 2013                
2013 grant of performance shares [Member] | Long-Term Equity Incentive plan [Member]                          
Additional general disclosures [Abstract]                          
Vesting period, description                         two-year performance period from January 1, 2013 through December 31, 2014
Range 1 of Exercise Prices [Member]                          
Stock options outstanding [Abstract]                          
Range of Exercise Prices, lower limit (in dollars per share)   $ 10.07us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Range of Exercise Prices, upper limit (in dollars per share)   $ 13.25us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Number Outstanding (in shares)   256,493us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Options Outstanding, Weighted Average Remaining Life (in years)   3 years 7 months 6 days                      
Options Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 12.40us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Number Exercisable (in shares)   177,007us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 12.61us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range1OfExercisePricesMember		                      
Range 2 of Exercise Prices [Member]                          
Stock options outstanding [Abstract]                          
Range of Exercise Prices, upper limit (in dollars per share)   $ 22.97us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range2OfExercisePricesMember		                      
Number Outstanding (in shares)   322,534us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range2OfExercisePricesMember		                      
Options Outstanding, Weighted Average Remaining Life (in years)   1 year 8 months 12 days                      
Options Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 22.27us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range2OfExercisePricesMember		                      
Number Exercisable (in shares)   322,534us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range2OfExercisePricesMember		                      
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 22.27us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range2OfExercisePricesMember		                      
Range 3 of Exercise Prices [Member]                          
Stock options outstanding [Abstract]                          
Range of Exercise Prices, lower limit (in dollars per share)   $ 23.19us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Range of Exercise Prices, upper limit (in dollars per share)   $ 24.03us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Number Outstanding (in shares)   143,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Options Outstanding, Weighted Average Remaining Life (in years)   1 year                      
Options Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 23.19us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Number Exercisable (in shares)   143,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 23.19us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range3OfExercisePricesMember		                      
Range 4 of Exercise Prices [Member]                          
Stock options outstanding [Abstract]                          
Range of Exercise Prices, lower limit (in dollars per share)   $ 24.27us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Range of Exercise Prices, upper limit (in dollars per share)   $ 25.31us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Number Outstanding (in shares)   334,950us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Options Outstanding, Weighted Average Remaining Life (in years)   1 year                      
Options Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 24.39us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Number Exercisable (in shares)   334,950us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 24.39us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range4OfExercisePricesMember		                      
Range 5 of Exercise Prices [Member]                          
Stock options outstanding [Abstract]                          
Range of Exercise Prices, lower limit (in dollars per share)   $ 10.07us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember		                      
Range of Exercise Prices, upper limit (in dollars per share)   $ 25.31us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember		                      
Number Outstanding (in shares)   1,056,977us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember		                      
Options Outstanding, Weighted Average Remaining Life (in years)   1 year 9 months 18 days                      
Options Outstanding, Weighted Average Exercise Price (in dollars per share)   $ 20.67us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember		                      
Number Exercisable (in shares)   977,491us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember		                      
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 21.38us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= bxs_Range5OfExercisePricesMember