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Nature of Operations and Summary of Significant Accounting Policies Direct Financing Leases (Details) | 12 Months Ended
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Dec. 31, 2017
Minimum |
Unguaranteed Residual Percentage Of Cost [Line Items] |
Unguaranteed residual percent of cost | 3.00%
Maximum |
Unguaranteed Residual Percentage Of Cost [Line Items] |
Unguaranteed residual percent of cost | 20.00%

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- Definition Unguaranteed Residual Percent Of Cost + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition [Line Items] for Unguaranteed Residual Percentage Of Cost [Table] + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |