XML 86 R67.htm IDEA: XBRL DOCUMENT
v3.19.3

Commitments and Contingencies SBA Recourse Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Beginning balance | $ 2,068 | $ 2,415 | $ 2,956 | $ 2,849
SBA recourse provision | (427) | 314 | 167 | 118
SBA Loan Charge Offs, Net | 2 | 0 | (1,480) | (238)
Ending balance | $ 1,643 | $ 2,729 | $ 1,643 | $ 2,729

X
- Definition SBA Loan Charge Offs, Net + References No definition available. + Details
Name: | fbiz_SBALoanChargeOffsNet
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- Definition SBA Recourse Reserve + References No definition available. + Details
Name: | fbiz_SBARecourseReserve
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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