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COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Before Tax Amount [Abstract]    
Other comprehensive income, before tax $ 10,816us-gaap_OtherComprehensiveIncomeLossBeforeTax $ 12,804us-gaap_OtherComprehensiveIncomeLossBeforeTax
Tax Effect [Abstract]    
Other comprehensive income, tax effect (4,163)us-gaap_OtherComprehensiveIncomeLossTax (4,905)us-gaap_OtherComprehensiveIncomeLossTax
Net of Tax Amount [Abstract]    
Other comprehensive income, net of tax 6,653us-gaap_OtherComprehensiveIncomeLossNetOfTax 7,899us-gaap_OtherComprehensiveIncomeLossNetOfTax
Net income 32,266us-gaap_NetIncomeLoss 28,444us-gaap_NetIncomeLoss
Comprehensive income 38,919us-gaap_ComprehensiveIncomeNetOfTax 36,343us-gaap_ComprehensiveIncomeNetOfTax
Reclassification Adjustment For Net Losses (Gains) Realized In Net Income [Member]    
Before Tax Amount [Abstract]    
Amounts reclassified from accumulated OCI, before tax (14)bxs_OtherComprehensiveIncomeLossReclassificationAdjustmentsBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1] 4bxs_OtherComprehensiveIncomeLossReclassificationAdjustmentsBeforeTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1]
Tax Effect [Abstract]    
Reclassification adjustment for net gains realized in net income, tax effect 5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1] (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1]
Net of Tax Amount [Abstract]    
Amounts reclassified from accumulated OCI, net of tax (9)bxs_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1] 2bxs_OtherComprehensiveIncomeLossReclassificationAdjustmentsNetOfTax
/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis
= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember		 [1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Before Tax Amount [Abstract]    
Other comprehensive loss before reclassifications, before tax 9,033bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 12,062bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Tax Effect [Abstract]    
Unrealized losses arising during holding period, tax effect (3,481)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 (4,621)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Net of Tax Amount [Abstract]    
Other Comprehensive Loss Before Reclassification Adjustments, Net Of Tax 5,552bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 7,441bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Accumulated Defined Benefit Plans Adjustment [Member]    
Before Tax Amount [Abstract]    
Other comprehensive loss before reclassifications, before tax 1,797bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] 738bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]
Tax Effect [Abstract]    
Recognized employee benefit plan net periodic benefit cost, tax effect (687)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] (282)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]
Net of Tax Amount [Abstract]    
Other Comprehensive Loss Before Reclassification Adjustments, Net Of Tax $ 1,110bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2] $ 456bxs_OtherComprehensiveIncomeLossBeforeReclassificationAdjustmentsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember		 [2]
[1] Reclassification adjustments for net gains (losses) on available-for-sale securities are reported as net security gains (losses) on the consolidated statements of income.
[2] Recognized employee benefit plan net periodic benefit cost include amortization of unrecognized transition amount, recognized prior service cost and recognized net loss. For more information, see Note 9 - Pension Benefits.