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Commitments and Contingencies (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Commitments and Contingencies Disclosure [Abstract] |  |
Accrued credit losses for financial instruments with off-balance-sheet risk | $ 0 | $ 0

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- Definition Accrued Credit Losses for Financial Instruments with Off-balance-sheet Risk + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration