XML 59 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments and Contingencies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Summary of SBA Recourse Reserve [Table Text Block] | The summary of the activity in the SBA recourse reserve for the year ended December 31, 2017 and 2016 is as follows:
|  | At December 31,
|  | 2017 |  | 2016
|  | (In Thousands)
Balance at the beginning of the period |  | $ | 1,750 |  |  | $ | — |
SBA recourse provision |  | 2,240 |  |  | 2,068 |
Charge-offs, net |  | (1,141 | ) |  | (318 | )
Balance at the end of the period |  | $ | 2,849 |  |  | $ | 1,750 |
Lending Related And Other Commitments | Financial instruments whose contract amounts represent potential credit risk at December 31, 2017 and 2016, respectively, are as follows:
|  | At December 31,
|  | 2017 |  | 2016
|  | (In Thousands)
Commitments to extend credit, primarily commercial loans |  | $ | 497,993 |  |  | $ | 539,146 |
Standby letters of credit |  | 13,845 |  |  | 11,771 |

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

X
- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
Name: | us-gaap_OtherCommitmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration