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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
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Troubled debt restructurings |  |
Number of Loans | 40 fbiz_FinancingReceivableModificationsNumberofContracts3 | 40 fbiz_FinancingReceivableModificationsNumberofContracts3
Recorded Investment | $ 9,307 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 | $ 9,396 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
Commercial real estate | Extension of term |  |
Troubled debt restructurings |  |
Number of Loans | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember
Recorded Investment | 35 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember | 39 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember
Commercial real estate | Interest Rate Concession |  |
Troubled debt restructurings |  |
Number of Loans | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringInterestRateConcessionMember | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringInterestRateConcessionMember
Recorded Investment | 56 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringInterestRateConcessionMember | 65 fbiz_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 | 26 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | 26 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment | 7,965 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | 7,984 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Commercial and industrial |  |
Troubled debt restructurings |  |
Number of Loans | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Recorded Investment | 151 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember | 155 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Commercial and industrial | Combination of extension and interest rate concession |  |
Troubled debt restructurings |  |
Number of Loans | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment | 151 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | 155 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Consumer and other | Extension of term |  |
Troubled debt restructurings |  |
Number of Loans | 3 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember | 3 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember
Recorded Investment | 735 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringExtensionOfTermMember | 753 fbiz_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 | 5 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | 5 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember
Recorded Investment | $ 365 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember | $ 400 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = fbiz_TroubledDebtRestructuringCombinationOfExtensionOfTermAndInterestRateConcessionMember

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