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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Installment
Mar. 31, 2014
Dec. 31, 2014
401(k) Plan [Abstract]      
Period of service required to be eligible 3 months    
Minimum years of age to be eligible 18 years    
Maximum annual contribution per employee, percent (in hundredths) 100.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Employer matching contribution of first 1% (in hundredths) 100.00%fbss_DefinedContributionPlanEmployerMatchingContributionPercentageFirst1PercentOfDeferredCompensation    
Employer matching contribution for next 5% of employee contribution (in hundredths) 50.00%fbss_DefinedContributionPlanEmployerMatchingContributionPercentageNext5PercentOfEmployeeContribution    
Employer matching contribution, percent (in hundredths) 3.50%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent    
Additional safe harbor contribution by employer, percent (in hundredths) 6.00%fbss_AdditionalSafeHarborContributionByEmployerPercent    
401K Expense $ 164us-gaap_DefinedContributionPlanCostRecognized $ 162us-gaap_DefinedContributionPlanCostRecognized  
Deferred Compensation Plan [Abstract]      
Number of installments available, minimum 1fbss_DeferredCompensationArrangementWithIndividualNumberOfInstallmentsAvailableMinimum    
Number of installments available, maximum 5fbss_DeferredCompensationArrangementWithIndividualNumberOfInstallmentsAvailableMaximum    
Deferred compensation expense 8us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 11us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense  
Cash surrender value of life insurance 1,249us-gaap_CashSurrenderValueOfLifeInsurance   1,241us-gaap_CashSurrenderValueOfLifeInsurance
Life Insurance, Corporate or Bank Owned, Change in Value $ 8us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue $ 8us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue