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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
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Mar. 31, 2015 | Dec. 31, 2014
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | $ 44,763 us-gaap_DebtAndCapitalLeaseObligations | $ 44,309 us-gaap_DebtAndCapitalLeaseObligations
Borrowed funds, weighted average balance | 43,804 fbiz_BorrowedFundsWeightedAverageBalance | 29,020 fbiz_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 | 40,753 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember | 42,299 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_LongTermDebtMember
Short-term borrowings |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | 4,010 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember | 2,010 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_ShortTermDebtTypeAxis = us-gaap_ShortTermDebtMember
Federal funds purchased |  |
Composition of Borrowed Funds [Line Items] |  |
Borrowed funds | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember
Borrowed funds, weighted average balance | 0 fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_FederalFundsPurchasedMember | 237 fbiz_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 | 10,012 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember | 10,058 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember
Borrowed funds, weighted average balance | 10,042 fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = fbiz_FHLBandOtherBorrowingsMember | 5,093 fbiz_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 | 1,510 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 1,010 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember
Borrowed funds, weighted average balance | 521 fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 13 fbiz_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 | 22,926 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember | 22,926 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember
Borrowed funds, weighted average balance | 22,926 fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember | 13,362 fbiz_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 | 10,315 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember | 10,315 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember
Borrowed funds, weighted average balance | $ 10,315 fbiz_BorrowedFundsWeightedAverageBalance / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember | $ 10,315 fbiz_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 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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