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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	$ 0fbiz_TotalGainsLossesOnImpairedLoans	$ 0fbiz_TotalGainsLossesOnImpairedLoans
Total gains (losses) on foreclosed properties	0us-gaap_ImpairmentOfRealEstate	(4)us-gaap_ImpairmentOfRealEstate
Loan servicing rights	1,027us-gaap_ServicingAssetAtFairValueAmount	943us-gaap_ServicingAssetAtFairValueAmount
Total gains (losses) on servicing assets	0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions	0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions
Impaired loans
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis
Assets measured on a non-recurring basis, fair value	8,363us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember	8,565us-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	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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	6,739us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	7,025us-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	1,624us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	1,540us-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	1,566us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember	1,693us-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	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Loan servicing rights	0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-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	1,566us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	1,693us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Loan servicing rights	0us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-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	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_AssetsFairValueDisclosureNonrecurring / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Loan servicing rights	$ 1,027us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 943us-gaap_ServicingAssetAtFairValueAmount / us-gaap_FairValueByAssetClassAxis = fbiz_ForeclosedPropertiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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Total Gains (Losses) on Impaired Loans

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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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.

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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.

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