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Significant Events Narrative (Details) | 6 Months Ended
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Jun. 30, 2020 USD ($)
Significant Events [Abstract] |
Increase in Loans and Leases Receivable, Allowance | $ 7,900,000
Percent Increase in Loans and Leases Receivable, Allowance | 40.70%
Financing Receivable, Allowance for Credit Losses, Increase due to Economic Conditions | $ 4,300,000
Financing Receivable, Allowance for Credit Losses, Increase Due to Qualitative Factors | $ 953,000

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- Definition Increase in allowance for loan and lease losses attributable to qualitative factors, including, but not limited to, ongoing review and grading of the loan and lease portfolios, consideration of delinquency experience, and the level of loans and leases subject to more frequent review + References No definition available. + Details
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Period Type: | duration

X
- Definition Increase in allowance for loan and lease losses due to economic conditions, including, but not limited to, the increase in unemployment rate + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
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X
- Definition Increase in Loans and Leases Receivable, Allowance during the reporting period + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Percent Increase in Loans and Leases Receivable, Allowance + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | num:percentItemType
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X
- Definition Significant Events [Abstract] + References No definition available. + Details
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