2.4.0.8004450 - Disclosure - Employee Benefits (Details 5)truefalseIn Millions, except Per Share data, unless otherwise specifiedfalse1false USDfalsefalse$AS_OF_Jun30_2013http://www.sec.gov/CIK0001210227instant2013-06-30T00:00:000001-01-01T00:00:00PerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDollarStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$AS_OF_Dec31_2012http://www.sec.gov/CIK0001210227instant2012-12-31T00:00:000001-01-01T00:00:00PerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$1true 1us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]2false 2bncn_TotalUnrecognizedCompensationCostRelatedToNonVestedRestrictedStockAwardsbncn_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse23000002.3USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Total Unrecognized Compensation Cost Related to Non-Vested Restricted Stock Awards3false 2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse8.778.77USD$falsetruefalse2truefalsefalse7.737.73USD$falsetruefalsenum:perShareItemTypedecimalThe weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -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. false3ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValuefalseEmployee Benefits (Details 5) (USD $)HundredThousandsUnKnownNoRoundingUnKnowntruefalsefalseSheethttp://www.test2012TX.com/role/EmployeeBenefitsDetails523