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CONTINGENT LIABILITIES (Textual) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]    
Principal balance of mortgage loans previously sold subject to unresolved representation and warranty claims $ 12.7fbspra_UnresolvedRepresentationAndWarrantyClaims $ 13.5fbspra_UnresolvedRepresentationAndWarrantyClaims
Loss contingency accrual for mortgage repurchase reserve $ 2.4us-gaap_LossContingencyAccrualAtCarryingValue $ 2.5us-gaap_LossContingencyAccrualAtCarryingValue