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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Non-accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired
Non-accrual loans and leases	$ 9,352us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	$ 9,792us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Foreclosed properties, net	1,566us-gaap_ForeclosedAssets	1,693us-gaap_ForeclosedAssets		333us-gaap_ForeclosedAssets
Total non-performing assets	10,918fbiz_TotalNonperformingAssets	11,485fbiz_TotalNonperformingAssets
Performing troubled debt restructurings	1,972fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring	2,003fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring
Total impaired assets	12,890fbiz_ImpairedAssets	13,488fbiz_ImpairedAssets
Total non-accrual loans and leases to gross loans and leases	0.72%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans	0.76%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Total non-performing assets to total gross loans and leases plus foreclosed properties, net	0.84%fbiz_RatioOfTotalNonperformingAssetsToGrossLoansAndLeasesPlusForeclosedPropertiesNet	0.89%fbiz_RatioOfTotalNonperformingAssetsToGrossLoansAndLeasesPlusForeclosedPropertiesNet
Total non-performing assets to total assets	0.65%fbiz_RatioOfTotalNonperformingAssetsToTotalAssets	0.70%fbiz_RatioOfTotalNonperformingAssetsToTotalAssets
Allowance for loan and lease losses to gross loans and leases	1.13%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases	1.12%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases	1.43%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases
Allowance for loan and lease losses to non-accrual loans and leases	157.12%fbiz_RatioOfAllowanceForLoanAndLeasesLossesToNonAccrualLoansAndLeases	146.33%fbiz_RatioOfAllowanceForLoanAndLeasesLossesToNonAccrualLoansAndLeases
Commercial real estate — owner occupied
Financing Receivable, Impaired
Non-accrual loans and leases	493us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember	500us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember
Commercial real estate — non-owner occupied
Financing Receivable, Impaired
Non-accrual loans and leases	286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember	286us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember
Construction and land development
Financing Receivable, Impaired
Non-accrual loans and leases	4,849us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember	4,932us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember
Multi-family
Financing Receivable, Impaired
Non-accrual loans and leases	14us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember	17us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember
1-4 family
Financing Receivable, Impaired
Non-accrual loans and leases	910us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember	690us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember
Total non-accrual commercial real estate
Financing Receivable, Impaired
Non-accrual loans and leases	6,552us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember	6,425us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Allowance for loan and lease losses to gross loans and leases	1.07%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember		1.40%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial and industrial
Financing Receivable, Impaired
Non-accrual loans and leases	1,774us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember	2,318us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Allowance for loan and lease losses to gross loans and leases	1.24%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember		1.49%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember
Direct financing leases, net
Financing Receivable, Impaired
Non-accrual loans and leases	0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember	0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Allowance for loan and lease losses to gross loans and leases	1.25%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember		1.27%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember
Home equity and second mortgages
Financing Receivable, Impaired
Non-accrual loans and leases	323us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember	329us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember
Other
Financing Receivable, Impaired
Non-accrual loans and leases	703us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember	720us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember
Total non-accrual consumer and other loans
Financing Receivable, Impaired
Non-accrual loans and leases	$ 1,026us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember	$ 1,049us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember
Allowance for loan and lease losses to gross loans and leases	1.13%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember		1.57%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember

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Impaired Assets

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

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Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

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