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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Non-accrual Loans) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | $ 9,352 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 9,792 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  |
Foreclosed properties, net | 1,566 us-gaap_ForeclosedAssets | 1,693 us-gaap_ForeclosedAssets |  | 333 us-gaap_ForeclosedAssets
Total non-performing assets | 10,918 fbiz_TotalNonperformingAssets | 11,485 fbiz_TotalNonperformingAssets |  |
Performing troubled debt restructurings | 1,972 fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring | 2,003 fbiz_FinancingReceivableModificationsPerformingTroubledDebtRestructuring |  |
Total impaired assets | 12,890 fbiz_ImpairedAssets | 13,488 fbiz_ImpairedAssets |  |
Total non-accrual loans and leases to gross loans and leases | 0.72%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans | 0.76%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans |  |
Total non-performing assets to total gross loans and leases plus foreclosed properties, net | 0.84%fbiz_RatioOfTotalNonperformingAssetsToGrossLoansAndLeasesPlusForeclosedPropertiesNet | 0.89%fbiz_RatioOfTotalNonperformingAssetsToGrossLoansAndLeasesPlusForeclosedPropertiesNet |  |
Total non-performing assets to total assets | 0.65%fbiz_RatioOfTotalNonperformingAssetsToTotalAssets | 0.70%fbiz_RatioOfTotalNonperformingAssetsToTotalAssets |  |
Allowance for loan and lease losses to gross loans and leases | 1.13%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases | 1.12%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases | 1.43%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases |
Allowance for loan and lease losses to non-accrual loans and leases | 157.12%fbiz_RatioOfAllowanceForLoanAndLeasesLossesToNonAccrualLoansAndLeases | 146.33%fbiz_RatioOfAllowanceForLoanAndLeasesLossesToNonAccrualLoansAndLeases |  |
Commercial real estate — owner occupied |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 493 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember | 500 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableOwnerOccupiedMember |  |
Commercial real estate — non-owner occupied |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 286 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember | 286 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableNonOwnerOccupiedMember |  |
Construction and land development |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 4,849 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember | 4,932 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableConstructionAndLandDevelopmentMember |  |
Multi-family |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 14 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember | 17 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivableMultiFamilyMember |  |
1-4 family |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 910 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember | 690 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialRealEstateLoansReceivable14FamilyMember |  |
Total non-accrual commercial real estate |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 6,552 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 6,425 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Allowance for loan and lease losses to gross loans and leases | 1.07%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 1.40%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |
Commercial and industrial |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 1,774 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember | 2,318 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember |  |
Allowance for loan and lease losses to gross loans and leases | 1.24%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember |  | 1.49%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_CommercialAndIndustrialLoansReceivableMember |
Direct financing leases, net |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember | 0 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember |  |
Allowance for loan and lease losses to gross loans and leases | 1.25%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember |  | 1.27%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_FinanceLeasesFinancingReceivableMember |
Home equity and second mortgages |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 323 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember | 329 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_HomeEquityLoansAndSecondMortageLoansReceivableMember |  |
Other |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | 703 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember | 720 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_OtherLoansReceivableMember |  |
Total non-accrual consumer and other loans |  |  |  |
Financing Receivable, Impaired |  |  |  |
Non-accrual loans and leases | $ 1,026 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember | $ 1,049 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember |  |
Allowance for loan and lease losses to gross loans and leases | 1.13%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember |  | 1.57%fbiz_RatioOfAllowanceForLoanAndLeaseLossesToTotalGrossLoansAndLeases / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fbiz_TotalConsumerAndOtherLoansReceivableMember |

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