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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Receivables [Abstract] |  |
Unguaranteed Portion of Sold SBA loans Retained | $ 26,640 | $ 30,071
Other SBA Loans | 20,183 | 22,254
Small Business Administration Loans | $ 46,823 | $ 52,325

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- Definition Other SBA Loans, including, but not limited to SBA Express Loans and partially funding 7(a) program loans. + References No definition available. + Details
Name: | fbiz_OtherSBALoans
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Small Business Administration Loans on the balance sheet. + References No definition available. + Details
Name: | fbiz_SmallBusinessAdministrationLoans
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unguaranteed Portion of Sold SBA loans Retained on the balance sheet. + References No definition available. + Details
Name: | fbiz_UnguaranteedPortionofSoldSBAloansRetained
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration