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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Commitments to extend credit, primarily commercial loans
Lending Related Commitments by Type [Line Items]
Lending related commitments	$ 282,581	$ 257,150
Standby letters of credit
Lending Related Commitments by Type [Line Items]
Lending related commitments	$ 19,602	$ 17,840

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- Definition

Lending related commitments.

+ 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_LendingRelatedCommitmentsByTypeLineItems
Namespace Prefix:	fbiz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration