XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments and Contingencies (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract] |
Summary of SBA Recourse Reserve | The summary of the activity in the SBA recourse reserve is as follows:
|  | As of and for the Three Months Ended June 30, |  | As of and for the Six Months Ended June 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
|  | (In Thousands)
Balance at the beginning of the period |  | $ | 593 |  |  | $ | 1,086 |  |  | $ | 723 |  |  | $ | 1,345 |
SBA recourse provision (benefit) |  | 245 |  |  | (30) |  |  | 115 |  |  | (5) |
Charge-offs, net |  | (8) |  |  | (49) |  |  | (8) |  |  | (333) |
Balance at the end of the period |  | $ | 830 |  |  | $ | 1,007 |  |  | $ | 830 |  |  | $ | 1,007 |

X
- Definition Summary of SBA Recourse Reserve [Table Text Block] + References No definition available. + Details
Name: | fbiz_SummaryofSBARecourseReserveTableTextBlock
Namespace Prefix: | fbiz_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
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