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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Receivables [Abstract] |  |
Unguaranteed Portion of Sold SBA loans Retained | $ 23,898 | $ 30,071
Other SBA Loans | 22,024 | 22,254
Small Business Administration Loans | $ 45,922 | $ 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