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Leases (Narrative Disclosures) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Lease liabilities	$ 9,236	$ 10,175
Kansas City Metropolitan
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year	2,600
Lease liabilities	3,700
Tenant Improvement Allowance Recognized as a Lease Incentive	$ 1,100

X

- 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

X

- 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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=fbiz_KansasCityMetropolitanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: