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Junior Subordianted Debentures And Subordinated Debentures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
item
trust
Dec. 31, 2013
Jul. 30, 2012
Junior Subordinated Debentures And Subordinated Debentures [Abstract]      
Debt Instrument, Basis Spread on Variable Rate   200.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1  
Number of statutory business trusts "Trusts" 13bbx_NumberOfStatutoryBusinessTrusts    
Number of quarters of interest payment deferral, maximum 20bbx_NumberOfQuartersBeyondStatedMaturityDateJuniorSubordinatedDebtDeferralOfPaymentsOfInterest    
Trust Preferred Securities     $ 285.4bbx_TrustPreferredSecurities