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GOODWILL AND OTHER INTANGIBLE ASSETS (Estimated Future Amortization Expense) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items]  
For year ending December 31, 2015 $ 3,996us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
For year ending December 31, 2016 3,349us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
For year ending December 31, 2017 2,999us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
For year ending December 31, 2018 2,582us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
For year ending December 31, 2019 2,052us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Core Deposits [Member]  
Finite-Lived Intangible Assets [Line Items]  
For year ending December 31, 2015 487us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
For year ending December 31, 2016 451us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
For year ending December 31, 2017 419us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
For year ending December 31, 2018 390us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
For year ending December 31, 2019 363us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
Customer Relationships [Member]  
Finite-Lived Intangible Assets [Line Items]  
For year ending December 31, 2015 3,134us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
For year ending December 31, 2016 2,673us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
For year ending December 31, 2017 2,380us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
For year ending December 31, 2018 2,009us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
For year ending December 31, 2019 1,689us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Non-Solicitation Intangibles [Member]  
Finite-Lived Intangible Assets [Line Items]  
For year ending December 31, 2015 375us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bxs_NonSolicitationIntangiblesMember
For year ending December 31, 2016 225us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bxs_NonSolicitationIntangiblesMember
For year ending December 31, 2017 200us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bxs_NonSolicitationIntangiblesMember
For year ending December 31, 2018 $ 183us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= bxs_NonSolicitationIntangiblesMember