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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (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
Pre-Modification Recorded Investment	$ 13,495fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3	$ 13,495fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3
Post-Modification Recorded Investment	9,307fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3	9,396fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
Commercial real estate — owner occupied
Troubled debt restructurings
Number of Loans	2fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember	2fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Pre-Modification Recorded Investment	624fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember	624fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Post-Modification Recorded Investment	568fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember	577fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Commercial real estate — non-owner occupied
Troubled debt restructurings
Number of Loans	5fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember	5fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Pre-Modification Recorded Investment	1,095fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember	1,095fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Post-Modification Recorded Investment	905fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember	970fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Construction and land development
Troubled debt restructurings
Number of Loans	4fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember	4fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Pre-Modification Recorded Investment	6,260fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember	6,260fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Post-Modification Recorded Investment	5,051fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember	5,157fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Multi-family
Troubled debt restructurings
Number of Loans	1fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember	1fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
Pre-Modification Recorded Investment	184fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember	184fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
Post-Modification Recorded Investment	14fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember	17fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
1-4 family
Troubled debt restructurings
Number of Loans	16fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember	16fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Pre-Modification Recorded Investment	2,119fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember	2,119fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Post-Modification Recorded Investment	1,518fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember	1,368fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Commercial and industrial
Troubled debt restructurings
Number of Loans	4fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember	4fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Pre-Modification Recorded Investment	361fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember	361fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Post-Modification Recorded Investment	151fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember	155fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Direct financing leases, net
Troubled debt restructurings
Number of Loans	0fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember	0fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Pre-Modification Recorded Investment	0fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember	0fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Post-Modification Recorded Investment	0fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember	0fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Home equity and second mortgages
Troubled debt restructurings
Number of Loans	6fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember	6fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Pre-Modification Recorded Investment	772fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember	772fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Post-Modification Recorded Investment	398fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember	431fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Other
Troubled debt restructurings
Number of Loans	2fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember	2fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember
Pre-Modification Recorded Investment	2,080fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember	2,080fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember
Post-Modification Recorded Investment	$ 702fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember	$ 721fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember

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