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Commitments and Contingencies - Lending Related And Other Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Commitments to extend credit, primarily commercial loans
Lending Related Commitments By Type [LineItems]
Lending related commitments	$ 1,046,598	$ 1,198,031
Standby letters of credit
Lending Related Commitments By Type [LineItems]
Lending related commitments	$ 17,276	$ 17,938

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- Definition

Lending related commitments by type lineItems.

+ References

No definition available.

+ Details

Name:	fbiz_LendingRelatedCommitmentsByTypeLineitems
Namespace Prefix:	fbiz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

LendingRelatedCommitments

+ References

No definition available.

+ Details

Name:	fbiz_Lendingrelatedcommitments
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	fbiz_LendingRelatedCommitmentsByTypeAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fbiz_LendingRelatedCommitmentsByTypeAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: