XML 96 R83.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Other Assets Other Assets Tax Credit Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | $ 4,261,000 | $ 3,963,000 |  |
Investment Tax Credit Impairment Cost | 2,784,000 | 3,691,000 | $ 0 |
Investment in Community Development Entities | 6,591,000 | 7,106,000 |  |
Mitchell Street Apartments | Historic Rehabilitation Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | 570,000 | 563,000 |  |
Capital Contributions | 4,900,000 |  |  |
Investment Tax Credit Impairment Cost | 2,300,000 |  |  |
Gain on Sale of Tax Credits, Before Tax | 210,000 |  |  |
Tax Credit Benefits Recognized | $ 3,000,000 |  |  |
Kenosha | Historic Rehabilitation Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships |  |  |  | $ 417,000
Estimated Capital Contributions |  |  |  | $ 2,100,000
Rimrock Road | New Market Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
New Market Tax Credit Benefit, Period of Recognition | 7 years |  |  |
Federal New Market Tax Credits Not Yet Recognized | $ 1,400,000 |  |  |
Tax Credit Benefits Recognized | 450,000 | 375,000 |  |
BOC Investment | Historic Rehabilitation Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | $ 174,000 |  |  |
Capital Contributions |  | 2,800,000 |  |
Investment Tax Credit Impairment Cost |  | 3,300,000 |  |
Tax Credit Benefits Recognized |  | $ 3,800,000 |  |

X
- Definition Capital Contributions + References No definition available. + Details
Name: | fbiz_CapitalContributions
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated Capital Contributions + References No definition available. + Details
Name: | fbiz_EstimatedCapitalContributions
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Federal New Market Tax Credits Not Yet Recognized + References No definition available. + Details
Name: | fbiz_FederalNewMarketTaxCreditsNotYetRecognized
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gain on Sale of Tax Credits, Before Tax + References No definition available. + Details
Name: | fbiz_GainonSaleofTaxCreditsBeforeTax
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Investment Tax Credit, Impairment Cost + References No definition available. + Details
Name: | fbiz_InvestmentTaxCreditImpairmentCost
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Investment in Community Development Entities + References No definition available. + Details
Name: | fbiz_InvestmentinCommunityDevelopmentEntities
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment in Limited Partnerships + References No definition available. + Details
Name: | fbiz_InvestmentinLimitedPartnerships
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition New Market Tax Credit Benefit, Period of Recognition + References No definition available. + Details
Name: | fbiz_NewMarketTaxCreditBenefitPeriodofRecognition
Namespace Prefix: | fbiz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Credit Benefits Recognized + References No definition available. + Details
Name: | fbiz_TaxCreditBenefitsRecognized
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_TaxCreditCarryforwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=fbiz_MitchellStreetApartmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fbiz_HistoricRehabilitationTaxCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fbiz_KenoshaMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fbiz_RimrockRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=fbiz_NewMarketTaxCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fbiz_BOCInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |