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v3.20.4

Other Events CARES Act (Details) $ in Thousands | 3 Months Ended
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Dec. 31, 2020 USD ($)
Receivables [Abstract] |
SBA Paycheck Protection Program Loans Outstanding, Gross Amount | $ 228,900
SBA Paycheck Protection Program Interest Income, Loans | 5,300
SBA Paycheck Protection Program, Loan & Leases Receiveable, Deferred Income | $ 3,500

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- Definition SBA Paycheck Protection Program Interest Income, Loans + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition SBA Paycheck Protection Program, Loan & Leases Receiveable, Deferred Income + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition SBA Paycheck Protection Program Loans Outstanding, Gross Amount + References No definition available. + Details
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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