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Securities (Unrealized Losses Held-to-Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Fair Value |  |
Less than 12 months | $ 2,253 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | $ 10,035 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
12 months or longer | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Total | 2,253 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue | 10,035 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized Losses |  |
Less than 12 months | 8 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 | 85 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1
12 months or longer | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1
Total | 8 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 | 85 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1
U.S. Government agency obligations - government-sponsored enterprises |  |
Fair Value |  |
Less than 12 months | 997 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 1,490 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
12 months or longer | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total | 997 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 1,490 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Losses |  |
Less than 12 months | 1 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 17 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
12 months or longer | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total | 1 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 17 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Municipal obligations |  |
Fair Value |  |
Less than 12 months | 1,256 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 2,222 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
12 months or longer | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
Total | 1,256 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 2,222 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
Unrealized Losses |  |
Less than 12 months | 7 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 18 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
12 months or longer | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
Total | 7 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember | 18 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_NontaxableMunicipalBondsMember
Collateralized mortgage obligations - government issued |  |
Fair Value |  |
Less than 12 months |  | 3,247 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
12 months or longer |  | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Total |  | 3,247 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Unrealized Losses |  |
Less than 12 months |  | 31 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
12 months or longer |  | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Total |  | 31 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Collateralized mortgage obligations - government-sponsored enterprises |  |
Fair Value |  |
Less than 12 months |  | 3,076 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12 months or longer |  | 0 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total |  | 3,076 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Unrealized Losses |  |
Less than 12 months |  | 19 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionLessthan12MonthsAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
12 months or longer |  | 0 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPosition12monthsorlongerAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Total |  | $ 19 fbiz_HeldtoMaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss1 / us-gaap_DebtSecurityAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember

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- Definition Held-to-Maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss1 + References No definition available. + Details
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- Definition This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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