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v3.22.2.2

Leases (Narrative Disclosures) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 USD ($)
Leases [Abstract] |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year | $ 1,600
Tenant Improvement Allowance Recognized as a Lease Incentive | $ 991

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- Definition Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year + References No definition available. + Details
Name: | fbiz_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityNewOperatingLeasesDuringTheYear
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Tenant Improvement Allowance Recognized as a Lease Incentive + References No definition available. + Details
Name: | fbiz_TenantImprovementAllowanceRecognizedAsALeaseIncentive
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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