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Fair Value Disclosures (Measured on a Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Total gains (losses) on impaired loans | $ 0 fbiz_TotalGainsLossesOnImpairedLoans | $ 0 fbiz_TotalGainsLossesOnImpairedLoans
Total gains (losses) on foreclosed properties | 0 us-gaap_ImpairmentOfRealEstate | (4)us-gaap_ImpairmentOfRealEstate
Loan servicing rights | 1,027 us-gaap_ServicingAssetAtFairValueAmount | 943 us-gaap_ServicingAssetAtFairValueAmount
Total gains (losses) on servicing assets | 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions | 0 us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions
Impaired loans |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 8,363 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember | 8,565 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember
Impaired loans | Fair Value Measurements - Level 1 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Impaired loans | Fair Value Measurements - Level 2 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 6,739 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 7,025 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Impaired loans | Fair Value Measurements - Level 3 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 1,624 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 1,540 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Foreclosed properties |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 1,566 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember | 1,693 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember
Foreclosed properties | Fair Value Measurements - Level 1 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Loan servicing rights | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Foreclosed properties | Fair Value Measurements - Level 2 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 1,566 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,693 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Loan servicing rights | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Foreclosed properties | Fair Value Measurements - Level 3 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Loan servicing rights | $ 1,027 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 943 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition This item represents the contra-account activity for provisions recognized for impairments of servicing assets which is offset against the value of servicing assets to arrive at a net carrying value as of the date of the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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