XML 34 R24.htm IDEA: XBRL DOCUMENT
v3.20.2

Significant Events (Policies) | 9 Months Ended
--- | ---
Sep. 30, 2020
Significant Events [Abstract] |
Goodwill, Method for Fair Value Determination | The income approach as well as the market approach were utilized by an independent third party to determine the fair value of the Corporation’s goodwill

X
- Definition Goodwill, Method for Fair Value Determination + References No definition available. + Details
Name: | fbiz_GoodwillMethodForFairValueDeterminationPolicyTextBlock
Namespace Prefix: | fbiz_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Significant Events [Abstract] + References No definition available. + Details
Name: | fbiz_SignificantEventsAbstract
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration