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Fair Value Measurement, Fair Value Inputs, Assets, Quantitative Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 55,752us-gaap_AvailableForSaleSecurities $ 57,406us-gaap_AvailableForSaleSecurities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 371us-gaap_AvailableForSaleSecurities
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366us-gaap_AvailableForSaleSecurities
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Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 55,381us-gaap_AvailableForSaleSecurities
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57,040us-gaap_AvailableForSaleSecurities
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Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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0us-gaap_AvailableForSaleSecurities
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Impaired Loans [Abstract]    
Total 49fbss_TotalAssetsIncludingOreoFairValueDisclosure
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Fair Value, Measurements, Recurring [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 55,752us-gaap_AvailableForSaleSecurities
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57,406us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 371us-gaap_AvailableForSaleSecurities
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366us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 55,381us-gaap_AvailableForSaleSecurities
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57,040us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Nonrecurring [Member]    
Impaired Loans [Abstract]    
Impaired Loans at fair value 3,013fbss_ImpairedLoansFairValueDisclosure
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3,158fbss_ImpairedLoansFairValueDisclosure
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Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Impaired Loans [Abstract]    
Impaired Loans at fair value 0fbss_ImpairedLoansFairValueDisclosure
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0fbss_ImpairedLoansFairValueDisclosure
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Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Impaired Loans [Abstract]    
Impaired Loans at fair value 2,964fbss_ImpairedLoansFairValueDisclosure
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3,109fbss_ImpairedLoansFairValueDisclosure
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Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Impaired Loans [Abstract]    
Impaired Loans at fair value 49fbss_ImpairedLoansFairValueDisclosure
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49fbss_ImpairedLoansFairValueDisclosure
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Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Impaired Loans [Abstract]    
Impaired Loans at fair value 49fbss_ImpairedLoansFairValueDisclosure
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Impaired Loans [Member] | Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member]    
Impaired Loans [Abstract]    
Weighted Average, Discount rate (in hundredths) 89.00%us-gaap_FairValueInputsDiscountRate
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