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Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Beginning balance	$ 423	$ 559	$ 441	$ 635
SBA recourse provision	341	114	323	38
SBA Loan Charge Offs, Net	(12)	0	(12)	0
Ending balance	$ 752	$ 673	$ 752	$ 673

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- Definition

SBA Loan Charge Offs, Net

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- Definition

SBA Recourse Provision (Benefit)

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No definition available.

+ Details

Name:	fbiz_SBARecourseProvisionBenefit
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- Definition

SBA Recourse Reserve

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No definition available.

+ Details

Name:	fbiz_SBARecourseReserve
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

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