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Significant Events CARES Act (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Significant Events [Abstract] |  |
SBA Paycheck Protection Program Loans Outstanding, Gross Amount | $ 272,700 | $ 228,900
SBA Paycheck Protection Program, Loan & Leases Receiveable, Deferred Income | 5,100 |
SBA Paycheck Protection Program Interest Income, Loans | $ 2,200 |

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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
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- Definition SBA Paycheck Protection Program, Loan & Leases Receiveable, Deferred Income + References No definition available. + Details
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- Definition SBA Paycheck Protection Program Loans Outstanding, Gross Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Significant Events [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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