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Nature of Operations and Summary of Significant Accounting Policies Other Investments (Details)
12 Months Ended
Dec. 31, 2014
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Maximum ownership percentage that is not consolidated 50.00%fbiz_MaximumOwnershipPercentageThatIsNotConsolidated
Investment in corporations minimum ownership percentage for accounting for using the equity method 20.00%fbiz_InvestmentInCorporationsMinimumOwnershipPercentageForAccountingForUsingEquityMethod
Investment in corporations maximum ownership percentage for accounting for at cost 20.00%fbiz_InvestmentInCorporationsMaximumOwnershipPercentageForAccountingForAtCost
Investment in limited partnerships maximum ownership percentage for accounting for at cost 3.00%fbiz_InvestmentInLimitedPartnershipsMaximumOwnershipPercentageForAccountingForAtCost
Minimum  
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Investment in limited partnerships ownership percentage for accounting for using the equity method 3.00%fbiz_InvestmentInLimitedPartnershipsOwnershipPercentageForAccountingForUsingEquityMethod
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Investment In Limited Partnerships Accounting Treatment [Line Items]  
Investment in limited partnerships ownership percentage for accounting for using the equity method 50.00%fbiz_InvestmentInLimitedPartnershipsOwnershipPercentageForAccountingForUsingEquityMethod
/ us-gaap_RangeAxis
= us-gaap_MaximumMember