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Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Beginning balance | $ 423 | $ 559 | $ 441 | $ 635
SBA recourse provision | 341 | 114 | 323 | 38
SBA Loan Charge Offs, Net | (12) | 0 | (12) | 0
Ending balance | $ 752 | $ 673 | $ 752 | $ 673

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- Definition SBA Loan Charge Offs, Net + References No definition available. + Details
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- Definition SBA Recourse Provision (Benefit) + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition SBA Recourse Reserve + 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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration