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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
loans
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment      
Loans and leases transferred to third parties total principal amount $ 15,800,000fbiz_LoansAndLeasesTransferredToThirdPartiesTotalPrincipalAmount $ 6,200,000fbiz_LoansAndLeasesTransferredToThirdPartiesTotalPrincipalAmount  
Gain (Loss) Recognized on Participation Interest in Originated Loans 0fbiz_GainLossRecognizedonParticipationInterestinOriginatedLoans    
Loan participations purchased on the Corporation's balance sheet 479,000fbiz_LoanParticipationsPurchasedOnCorporationsBalanceSheet   482,000fbiz_LoanParticipationsPurchasedOnCorporationsBalanceSheet
Total amount of outstanding loans transferred to third parties as loan participations 121,600,000fbiz_TotalAmountOfOutstandingLoansTransferredToThirdPartiesAsLoanParticipations   116,600,000fbiz_TotalAmountOfOutstandingLoansTransferredToThirdPartiesAsLoanParticipations
Total amount of loan participations remaining on the Corporations balance sheet 102,900,000fbiz_TotalAmountOfLoanParticipationsRemainingOnCorporationsBalanceSheet   96,400,000fbiz_TotalAmountOfLoanParticipationsRemainingOnCorporationsBalanceSheet
Loans in the participation sold portfolio, considered impaired 1,100,000fbiz_LoansInParticipationSoldPortfolioConsideredImpaired    
Residential Real Estate Loans Sold, Principal Amount 9,100,000fbiz_ResidentialRealEstateLoansSoldPrincipalAmount   0fbiz_ResidentialRealEstateLoansSoldPrincipalAmount
Total gross loans and leases receivable 1,298,067,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 986,221,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 1,281,792,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Non-accrual troubled debt restructurings 7,300,000fbiz_NonAccrualTroubledDebtRestructurings   7,400,000fbiz_NonAccrualTroubledDebtRestructurings
Unfunded commitments, troubled debt restructurings 0fbiz_UnfundedCommitmentsTroubledDebtRestructurings    
Troubled debt restructurings, subsequent default, number of loans 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1    
Loans and leases receivable, difference between recorded investment and unpaid principal balance 4,700,000fbiz_LoansAndLeasesReceivableDifferenceBetweenRecordedInvestmentAndUnpaidPrincipalBalance   4,400,000fbiz_LoansAndLeasesReceivableDifferenceBetweenRecordedInvestmentAndUnpaidPrincipalBalance
Performing troubled debt restructurings 1,972,000fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring   2,003,000fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring
Substandard      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 24,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		   27,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Special Mention      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		   0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Doubtful      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		   0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Loss      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable $ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		   $ 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember