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Commitments and Contingencies - SBA Recourse Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	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

X

- 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

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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