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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Loan Composition) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Receivables [Abstract]
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
Allowance for loan and lease losses	14,694us-gaap_LoansAndLeasesReceivableAllowance	14,329us-gaap_LoansAndLeasesReceivableAllowance
Deferred loan fees	1,131us-gaap_LoansAndLeasesReceivableDeferredIncome	1,025us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans and leases receivable, net	$ 1,282,242fbiz_LoansandLeasesReceivableandLoansHeldforSalenet	$ 1,266,438fbiz_LoansandLeasesReceivableandLoansHeldforSalenet

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Commercial Real Estate Loans Receivable - Multi-Family

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Commercial Real Estate Loans Receivable - Owner Occupied

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Loans and lease receivable, gross Home equity loans and second mortgage loans

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Loans and Leases Receivable and Loans Held for Sale, net of allowance for loan loss and deferred loan fees.

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The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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