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Derivative Financial Instruments (Narrative Disclosures) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivatives    
Interest rate swaps - assets $ 575,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue $ 946,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
Interest rate swaps - liabilities 575,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue 946,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
Derivative asset, fair value, amount offset against collateral 0us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral  
Interest rate derivatives, line item on income statement for gain (loss) other non-interest income  
Derivative hedging instruments 0us-gaap_DerivativeInstrumentsInHedgesAtFairValueNet  
To commercial borrowers, corporation receives fixed rates and pays floating rates    
Derivatives    
Interest rate swaps - assets 575,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
/ us-gaap_DerivativeByNatureAxis
= fbiz_ToCommercialBorrowersCorporationReceivesFixedRatesAndPaysFloatingRatesMember
 
To commercial borrowers, corporation receives fixed rates and pays floating rates | Minimum    
Derivatives    
Derivative, maturity date Mar. 15, 2016  
To commercial borrowers, corporation receives fixed rates and pays floating rates | Maximum    
Derivatives    
Derivative, maturity date Feb. 15, 2023  
To dealer countparties, corporation pays fixed rates and receives floating rates    
Derivatives    
Interest rate swaps - liabilities 575,000us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
/ us-gaap_DerivativeByNatureAxis
= fbiz_ToDealerCountpartiesCorporationPaysFixedRatesAndReceivesFloatingRatesMember
 
Interest rate derivative instruments not designated as hedging instruments at fair value, net (575,000)us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_DerivativeByNatureAxis
= fbiz_ToDealerCountpartiesCorporationPaysFixedRatesAndReceivesFloatingRatesMember
 
To dealer countparties, corporation pays fixed rates and receives floating rates | Minimum    
Derivatives    
Derivative, maturity date Mar. 15, 2016  
To dealer countparties, corporation pays fixed rates and receives floating rates | Maximum    
Derivatives    
Derivative, maturity date Feb. 15, 2023  
Not designated as hedging instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates    
Derivatives    
Derivative, notional amount 27,500,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= fbiz_ToCommercialBorrowersCorporationReceivesFixedRatesAndPaysFloatingRatesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
 
Not designated as hedging instrument | To dealer countparties, corporation pays fixed rates and receives floating rates    
Derivatives    
Derivative, notional amount $ 27,500,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= fbiz_ToDealerCountpartiesCorporationPaysFixedRatesAndReceivesFloatingRatesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember