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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
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Troubled debt restructurings |  |
Number of Loans | 40 fbiz_FinancingReceivableModificationsNumberofContracts3 | 40 fbiz_FinancingReceivableModificationsNumberofContracts3
Pre-Modification Recorded Investment | $ 13,495 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 | $ 13,495 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3
Post-Modification Recorded Investment | 9,307 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 | 9,396 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
Commercial real estate — owner occupied |  |
Troubled debt restructurings |  |
Number of Loans | 2 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember | 2 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Pre-Modification Recorded Investment | 624 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember | 624 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Post-Modification Recorded Investment | 568 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember | 577 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Commercial real estate — non-owner occupied |  |
Troubled debt restructurings |  |
Number of Loans | 5 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember | 5 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Pre-Modification Recorded Investment | 1,095 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember | 1,095 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Post-Modification Recorded Investment | 905 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember | 970 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Construction and land development |  |
Troubled debt restructurings |  |
Number of Loans | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember | 4 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Pre-Modification Recorded Investment | 6,260 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember | 6,260 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Post-Modification Recorded Investment | 5,051 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember | 5,157 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Multi-family |  |
Troubled debt restructurings |  |
Number of Loans | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember | 1 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
Pre-Modification Recorded Investment | 184 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember | 184 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
Post-Modification Recorded Investment | 14 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember | 17 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
1-4 family |  |
Troubled debt restructurings |  |
Number of Loans | 16 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember | 16 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Pre-Modification Recorded Investment | 2,119 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember | 2,119 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Post-Modification Recorded Investment | 1,518 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember | 1,368 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
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
Pre-Modification Recorded Investment | 361 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember | 361 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Post-Modification Recorded Investment | 151 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember | 155 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Direct financing leases, net |  |
Troubled debt restructurings |  |
Number of Loans | 0 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember | 0 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Pre-Modification Recorded Investment | 0 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember | 0 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Post-Modification Recorded Investment | 0 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember | 0 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Home equity and second mortgages |  |
Troubled debt restructurings |  |
Number of Loans | 6 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember | 6 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Pre-Modification Recorded Investment | 772 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember | 772 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Post-Modification Recorded Investment | 398 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember | 431 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Other |  |
Troubled debt restructurings |  |
Number of Loans | 2 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember | 2 fbiz_FinancingReceivableModificationsNumberofContracts3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember
Pre-Modification Recorded Investment | 2,080 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember | 2,080 fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember
Post-Modification Recorded Investment | $ 702 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember | $ 721 fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember

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