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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
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Receivables [Abstract] |  |  |
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
Allowance for loan and lease losses | 14,694 us-gaap_LoansAndLeasesReceivableAllowance | 14,329 us-gaap_LoansAndLeasesReceivableAllowance |
Deferred loan fees | 1,131 us-gaap_LoansAndLeasesReceivableDeferredIncome | 1,025 us-gaap_LoansAndLeasesReceivableDeferredIncome |
Loans and leases receivable, net | $ 1,282,242 fbiz_LoansandLeasesReceivableandLoansHeldforSalenet | $ 1,266,438 fbiz_LoansandLeasesReceivableandLoansHeldforSalenet |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(7),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6378556&loc=d3e10152-111534 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 9 + Details
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