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Other Assets Other Assets Tax Credit Narrative (Details) (Federal New Market Tax Credit [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal New Market Tax Credit [Member]
     
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Amount $ 2,600,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= fbiz_FederalNewMarketTaxCreditMember
   
Federal Tax Credits Used to Offset Income $ 375,000fbiz_FederalTaxCreditsUsedtoOffsetIncome
/ us-gaap_TaxCreditCarryforwardAxis
= fbiz_FederalNewMarketTaxCreditMember
$ 0fbiz_FederalTaxCreditsUsedtoOffsetIncome
/ us-gaap_TaxCreditCarryforwardAxis
= fbiz_FederalNewMarketTaxCreditMember
$ 0fbiz_FederalTaxCreditsUsedtoOffsetIncome
/ us-gaap_TaxCreditCarryforwardAxis
= fbiz_FederalNewMarketTaxCreditMember