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DERIVATIVE INSTRUMENTS AND OFFSETTING ASSETS AND LIABILITIES (Offsetting Of Derivative Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Offsetting Assets And Liabilities [Line Items]      
Gross Amount Recognized $ 27,497us-gaap_DerivativeFairValueOfDerivativeAsset $ 24,181us-gaap_DerivativeFairValueOfDerivativeAsset $ 28,275us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amount Offset        
Net Amount Recognized 27,497us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 24,181us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 28,275us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Financial Instruments        
Financial Collateral Pledged       
Net Amount 27,497bxs_DerivativeFairValueAssetsNet 24,181bxs_DerivativeFairValueAssetsNet 28,275bxs_DerivativeFairValueAssetsNet
Gross Amount Recognized 408,553us-gaap_DerivativeLiabilityFairValueGrossAsset 411,373us-gaap_DerivativeLiabilityFairValueGrossAsset 483,547us-gaap_DerivativeLiabilityFairValueGrossAsset
Gross Amount Offset        
Net Amount Recognized 408,553us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 411,373us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 483,547us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Financial Instruments (384,829)bxs_DerivativeLiabilityFairValueFinancialInstruments (388,166)bxs_DerivativeLiabilityFairValueFinancialInstruments (456,303)bxs_DerivativeLiabilityFairValueFinancialInstruments
Financial Collateral Pledged (22,178)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged (22,004)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged (27,081)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged
Net Amount 1,546bxs_DerivativeFairValueLiabilitiesNet 1,203bxs_DerivativeFairValueLiabilitiesNet 163bxs_DerivativeFairValueLiabilitiesNet
Forward Commitments [Member]      
Offsetting Assets And Liabilities [Line Items]      
Gross Amount Recognized 5,319us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
2,177us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,194us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Gross Amount Offset        
Net Amount Recognized 5,319us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
2,177us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,194us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Financial Instruments        
Financial Collateral Pledged       
Net Amount 5,319bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
2,177bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,194bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Gross Amount Recognized 1,546us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,203us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
163us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Gross Amount Offset        
Net Amount Recognized 1,546us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,203us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
163us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Financial Instruments        
Financial Collateral Pledged       
Net Amount 1,546bxs_DerivativeFairValueLiabilitiesNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
1,203bxs_DerivativeFairValueLiabilitiesNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
163bxs_DerivativeFairValueLiabilitiesNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
Loan/Lease Interest Rate Swaps [Member]      
Offsetting Assets And Liabilities [Line Items]      
Gross Amount Recognized 22,178us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
22,004us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
27,081us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Gross Amount Offset        
Net Amount Recognized 22,178us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
22,004us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
27,081us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Financial Instruments        
Financial Collateral Pledged       
Net Amount 22,178bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
22,004bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
27,081bxs_DerivativeFairValueAssetsNet
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Gross Amount Recognized 22,178us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
22,004us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
27,081us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Gross Amount Offset        
Net Amount Recognized 22,178us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
22,004us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
27,081us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Financial Instruments        
Financial Collateral Pledged (22,178)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
(22,004)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
(27,081)bxs_DerivativeLiabilityFairValueFinancialCollateralPledged
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
Repurchase Arrangements [Member]      
Offsetting Assets And Liabilities [Line Items]      
Gross Amount Recognized 384,829us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
388,166us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
456,303us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
Gross Amount Offset        
Net Amount Recognized 384,829us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
388,166us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
456,303us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
Financial Instruments (384,829)bxs_DerivativeLiabilityFairValueFinancialInstruments
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
(388,166)bxs_DerivativeLiabilityFairValueFinancialInstruments
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
(456,303)bxs_DerivativeLiabilityFairValueFinancialInstruments
/ us-gaap_DerivativeByNatureAxis
= bxs_RepurchaseArrangementsMember
Financial Collateral Pledged