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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Fair Value of Credit Impaired Loans Acquired) (Details) (Purchased Credit Impaired Loans [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Purchased Credit Impaired Loans [Member] |  |
Schedule of Contractually Required Payments Receivable, Expected Cash Flows, and Fair Value of Credit Impaired Loans Acquired [Line Items] |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition | $ 6,783 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember | $ 6,874 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember
Non-Accretable Difference On Credit Impaired Loans Acquired in Business Acquisitions | (2,252)fbiz_NonAccretableDifferenceOnCreditImpairedLoansAcquiredinBusinessAcquisitions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember | (2,173)fbiz_NonAccretableDifferenceOnCreditImpairedLoansAcquiredinBusinessAcquisitions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition | 4,531 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember | 4,701 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember
Accretable Yield On Credit Impaired Loans Acquired in Business Acquisitions | (566)fbiz_AccretableYieldOnCreditImpairedLoansAcquiredinBusinessAcquisitions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember | (676)fbiz_AccretableYieldOnCreditImpairedLoansAcquiredinBusinessAcquisitions / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value | $ 3,965 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember | $ 4,025 us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbiz_PurchasedCreditImpairedLoansMember

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- Definition Accretable Yield On Credit Impaired Loans Acquired in Business Acquisitions + References No definition available. + Details
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Period Type: | instant

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- Definition Non-Accretable Difference On Credit Impaired Loans Acquired in Business Acquisitions + References No definition available. + Details
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- Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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