SUBSEQUENT EVENTS (Details) (Acquisition [Member], USD $)	6 Months Ended
Jun. 30, 2012
Acquisition [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Jul. 02, 2012
Subsequent Event, Amount	$ 6,750,000
Additional aggregate consideration	$ 2,000,000
Number of annual installments for additional aggregate consideration	3

For contingent consideration arrangements recognized in connection with a business combination, this element represents the amount of the contingent payments.

No definition available.

+ Details

Name:	bxs_BusinessCombinationContingentConsideration
Namespace Prefix:	bxs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of annual installments for additional aggregate consideration.

+ References

No definition available.

+ Details

Name:	bxs_NumberOfAnnualInstallmentsForAdditionalAggregateConsideration
Namespace Prefix:	bxs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued or available to be issued.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Name Accounting Standards Codification

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 165

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_SubsequentEventAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date of subsequent event occurrence or of indication that subsequent event occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 855

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

+ Details

Name:	us-gaap_SubsequentEventsDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration