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

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