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Stockholders' Equity and Regulatory Capital (Narrative Disclosures) (Details) (USD $)
0 Months Ended 12 Months Ended
Jul. 15, 2008
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Jun. 05, 2008
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Dec. 31, 2014
Dec. 31, 2013
Regulatory Capital Requirements [Abstract]        
Dividend declared of one common share purchase right for each outstanding share of common stock   1fbiz_DividendDeclaredOfOneCommonSharePurchaseRightForEachOutstandingShareOfCommonStock    
Dividend paid of one common share purchase right for each outstanding share of common stock 1fbiz_DividendPaidOfOneCommonSharePurchaseRightForEachOutstandingShareOfCommonStock      
Common stock, par value     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Class of right, exercise price of rights     $ 85.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
Class of right, exercise price for each one-half of a common share     42.50fbiz_ClassOfRightExercisePriceForEachOneHalfOfCommonShare  
Rights will be exercisable only if a person or group acquires fifteen percent or more of the corporation’s common stock or announces a tender offer for such stock     15.00%fbiz_RightsWillBeExercisableOnlyIfPersonOrGroupAcquiresFifteenPercentOrMoreOfCorporationsCommonStockOrAnnouncesTenderOfferForSuchStock  
Value of additional shares acquired under the shareholder rights plan, common stock, market value multiplier of market value of common stock     2fbiz_ValueOfAdditionalSharesAcquiredUnderShareholderRightsPlanCommonStockMarketValueMultiplierOfMarketValueOfCommonStock  
Description of possible effects of noncompliance or less than adequately capitalized     Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions on the part of regulators, that if undertaken, could have a direct material effect on the Banks’ assets, liabilities and certain off-balance-sheet items as calculated under regulatory practices.