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Commitments and Contingencies - SBA Recourse Reserve (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Beginning balance | $ 1,081 | $ 423 | $ 955 | $ 441
SBA (benefit) recourse | (9) | 341 | 117 | 323
Charge-offs, net | (166) | (12) | (166) | (12)
Ending balance | $ 906 | $ 752 | $ 906 | $ 752

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- Definition SBA Recourse Provision (Benefit) + References No definition available. + Details
Name: | fbiz_SBARecourseProvisionBenefit
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition SBA Recourse Reserve + References No definition available. + Details
Name: | fbiz_SBARecourseReserve
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition SBA Loan Charge Offs, Net + References No definition available. + Details
Name: | fbiz_SbaLoanChargeOffsNet
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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