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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings by Modification Type) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
loans
Dec. 31, 2014
loans
Troubled debt restructurings    
Number of Loans 40fbiz_FinancingReceivableModificationsNumberofContracts3 40fbiz_FinancingReceivableModificationsNumberofContracts3
Recorded Investment $ 9,307fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 $ 9,396fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
Commercial real estate | Extension of term    
Troubled debt restructurings    
Number of Loans 1fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
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/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember
Recorded Investment 35fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember		 39fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember
Commercial real estate | Interest Rate Concession    
Troubled debt restructurings    
Number of Loans 1fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringInterestRateConcessionMember		 1fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringInterestRateConcessionMember
Recorded Investment 56fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringInterestRateConcessionMember		 65fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringInterestRateConcessionMember
Commercial real estate | Combination of extension and interest rate concession    
Troubled debt restructurings    
Number of Loans 26fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 26fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment 7,965fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 7,984fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Commercial and industrial    
Troubled debt restructurings    
Number of Loans 4fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember		 4fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
Recorded Investment 151fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember		 155fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
Commercial and industrial | Combination of extension and interest rate concession    
Troubled debt restructurings    
Number of Loans 4fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 4fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment 151fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 155fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_CommercialAndIndustrialLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Consumer and other | Extension of term    
Troubled debt restructurings    
Number of Loans 3fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember		 3fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember
Recorded Investment 735fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember		 753fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringExtensionOfTermMember
Consumer and other | Combination of extension and interest rate concession    
Troubled debt restructurings    
Number of Loans 5fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 5fbiz_FinancingReceivableModificationsNumberofContracts3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment $ 365fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember		 $ 400fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbiz_TotalConsumerAndOtherLoansReceivableMember
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember