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Commitments and Contingencies Commitments and Contingencies (SBA Recourse Reserve) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Beginning Balance	$ 441	$ 635
SBA recourse provision	775	(188)
SBA Loan Charge Offs, Net	(261)	(6)
Ending Balance	$ 955	$ 441

X

- 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

X

- Definition

SBA Recourse Provision

+ References

No definition available.

+ Details

Name:	fbiz_SBARecourseProvision
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