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Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Beginning balance	$ 441	$ 635
SBA recourse provision	(18)	(76)
Ending balance	$ 423	$ 559

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration