XML 76 R66.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Commitments and Contingencies Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |
SBA Loans, Probability of Future Losses | $ 1,700,000 |  |
SBA Recourse Provision | $ 6,000 | $ 0 | $ 2,068,000

X
- Definition SBA Loans, Probability of Future Losses + References No definition available. + Details
Name: | fbiz_SBALoansProbabilityofFutureLosses
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition SBA Recourse Provision + References No definition available. + Details
Name: | fbiz_SBARecourseProvision
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration