XML 38 R86.htm IDEA: XBRL DOCUMENT v2.4.1.9
Goodwill and Intangible Assets (Narrative Disclosures) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 01, 2014
Goodwill [Line Items]        
Investment in Community Development Entities $ 7,500,000fbiz_InvestmentinCommunityDevelopmentEntities $ 0fbiz_InvestmentinCommunityDevelopmentEntities    
Servicing Asset at Fair Value, Amount 943,000us-gaap_ServicingAssetAtFairValueAmount 0us-gaap_ServicingAssetAtFairValueAmount 0us-gaap_ServicingAssetAtFairValueAmount  
Servicing Asset at Amortized Cost, Amortization 24,000us-gaap_ServicingAssetAtAmortizedValueAmortization1      
Aslin Group, Inc.        
Goodwill [Line Items]        
Goodwill $ 10,667,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= fbiz_AslinGroupInc.Member
    $ 10,667,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= fbiz_AslinGroupInc.Member