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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Loans by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financing Receivable, Recorded Investment      
Commercial real estate — owner occupied $ 163,982fbiz_CommercialRealEstateLoansReceivableOwnerOccupied $ 163,884fbiz_CommercialRealEstateLoansReceivableOwnerOccupied  
Commercial real estate — non-owner occupied 404,931fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied 417,962fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied  
Construction and land development 121,211fbiz_CommercialRealEstateConstructionandLandDevelopment 121,160fbiz_CommercialRealEstateConstructionandLandDevelopment  
Multi-family 84,163fbiz_CommercialRealEstateLoansReceivableMultiFamily 72,578fbiz_CommercialRealEstateLoansReceivableMultiFamily  
1-4 family (1) 40,159fbiz_CommercialRealEstateLoansReceivable14Family 36,182fbiz_CommercialRealEstateLoansReceivable14Family  
Total commercial real estate 814,446us-gaap_LoansReceivableCommercialRealEstate 811,766us-gaap_LoansReceivableCommercialRealEstate  
Commercial and industrial (2) 426,413us-gaap_LoansReceivableCommercialAndIndustrial 416,654us-gaap_LoansReceivableCommercialAndIndustrial  
Direct financing leases, net 31,644us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases 34,165us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases  
Home equity and second mortgages 9,032fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans 7,866fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans  
Other 16,532us-gaap_LoansAndLeasesReceivableConsumerOther 11,341us-gaap_LoansAndLeasesReceivableConsumerOther  
Total consumer and other 25,564fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther 19,207fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther  
Total gross loans and leases receivable 1,298,067us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 1,281,792us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 986,221us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Category as a % of total portfolio 100.00%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases 100.00%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases  
Category I      
Financing Receivable, Recorded Investment      
Commercial real estate — owner occupied 128,449fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 131,094fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Commercial real estate — non-owner occupied 368,016fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 378,671fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Construction and land development 100,815fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 100,934fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Multi-family 82,500fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 70,897fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
1-4 family (1) 30,322fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 25,997fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Total commercial real estate 710,102us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 707,593us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Commercial and industrial (2) 380,318us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 383,755us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Direct financing leases, net 29,926us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 32,756us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Home equity and second mortgages 8,245fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 7,039fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Other 15,830us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 10,570us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Total consumer and other 24,075fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 17,609fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Total gross loans and leases receivable 1,144,421us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 1,141,713us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Category as a % of total portfolio 88.17%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		 89.07%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIMember		  
Category II      
Financing Receivable, Recorded Investment      
Commercial real estate — owner occupied 18,511fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 15,592fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Commercial real estate — non-owner occupied 25,027fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 20,823fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Construction and land development 8,519fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 8,193fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Multi-family 746fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 751fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
1-4 family (1) 4,746fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 5,278fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Total commercial real estate 57,549us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 50,637us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Commercial and industrial (2) 22,493us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 18,524us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Direct financing leases, net 1,469us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 1,120us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Home equity and second mortgages 201fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 205fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Other 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 50us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Total consumer and other 201fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 255fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Total gross loans and leases receivable 81,712us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 70,536us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Category as a % of total portfolio 6.29%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		 5.50%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiMember		  
Category III      
Financing Receivable, Recorded Investment      
Commercial real estate — owner occupied 16,454fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 16,621fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Commercial real estate — non-owner occupied 10,921fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 17,498fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Construction and land development 6,810fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 6,876fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Multi-family 903fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 913fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
1-4 family (1) 3,313fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 3,336fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Total commercial real estate 38,401us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 45,244us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Commercial and industrial (2) 21,797us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 12,026us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Direct financing leases, net 249us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 289us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Home equity and second mortgages 163fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 189fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Other 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 0us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Total consumer and other 163fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 189fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Total gross loans and leases receivable 60,610us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 57,748us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Category as a % of total portfolio 4.67%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		 4.51%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIiiMember		  
Category IV      
Financing Receivable, Recorded Investment      
Commercial real estate — owner occupied 568fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 577fbiz_CommercialRealEstateLoansReceivableOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Commercial real estate — non-owner occupied 967fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 970fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupied
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Construction and land development 5,067fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 5,157fbiz_CommercialRealEstateConstructionandLandDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Multi-family 14fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 17fbiz_CommercialRealEstateLoansReceivableMultiFamily
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
1-4 family (1) 1,778fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 1,571fbiz_CommercialRealEstateLoansReceivable14Family
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Total commercial real estate 8,394us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 8,292us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Commercial and industrial (2) 1,805us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 2,349us-gaap_LoansReceivableCommercialAndIndustrial
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Direct financing leases, net 0us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 0us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Home equity and second mortgages 423fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 433fbiz_LoansAndLeaseReceivableGrossHomeEquityLoansAndSecondMortgageLoans
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Other 702us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 721us-gaap_LoansAndLeasesReceivableConsumerOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Total consumer and other 1,125fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 1,154fbiz_LoansAndLeasesReceivableGrossTotalConsumerAndOther
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Total gross loans and leases receivable $ 11,324us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 $ 11,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		  
Category as a % of total portfolio 0.87%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember		 0.92%fbiz_CategoryRatingAsPercentageOfTotalLoansAndLeases
/ us-gaap_InternalCreditAssessmentAxis
= fbiz_CategoryIvMember