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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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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