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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 44,763us-gaap_DebtAndCapitalLeaseObligations	$ 44,309us-gaap_DebtAndCapitalLeaseObligations
Borrowed funds, weighted average balance	43,804fbiz_BorrowedFundsWeightedAverageBalance	29,020fbiz_BorrowedFundsWeightedAverageBalance
Borrowed funds, interest rate during period	6.55%us-gaap_DebtInstrumentInterestRateDuringPeriod	7.24%us-gaap_DebtInstrumentInterestRateDuringPeriod
Long-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	40,753us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember	42,299us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Short-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	4,010us-gaap_DebtAndCapitalLeaseObligations / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember	2,010us-gaap_DebtAndCapitalLeaseObligations / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember
Federal funds purchased
Composition of Borrowed Funds [Line Items]
Borrowed funds	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember	0us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember
Borrowed funds, weighted average balance	0fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember	237fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember
Borrowed funds, interest rate during period	0.00%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember	0.82%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember
FHLB and Other Borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	10,012us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember	10,058us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember
Borrowed funds, weighted average balance	10,042fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember	5,093fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember
Borrowed funds, interest rate during period	1.51%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember	0.56%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember
Line of credit
Composition of Borrowed Funds [Line Items]
Borrowed funds	1,510us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember	1,010us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Borrowed funds, weighted average balance	521fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember	13fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Borrowed funds, interest rate during period	3.24%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember	3.30%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Subordinated notes payable
Composition of Borrowed Funds [Line Items]
Borrowed funds	22,926us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember	22,926us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember
Borrowed funds, weighted average balance	22,926fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember	13,362fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember
Borrowed funds, interest rate during period	6.94%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember	7.07%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember
Junior subordinated notes
Composition of Borrowed Funds [Line Items]
Borrowed funds	10,315us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember	10,315us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember
Borrowed funds, weighted average balance	$ 10,315fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember	$ 10,315fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember
Borrowed funds, interest rate during period	10.64%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember	10.78%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember

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- Definition

Borrowed Funds, Weighted Average Balance

+ References

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

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The average effective interest rate during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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-Publisher SEC

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-Number 210

-Section 02

-Paragraph 22

-Article 5



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