XML 63 R53.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Troubled Debt Restructurings) (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 loans | Jun. 30, 2017 loans | Dec. 31, 2017 USD ($)
Troubled debt restructurings |  |  |
Number of loans | loans | 0 | 3 |
Pre-Modification Recorded Investment |  |  | $ 3,731
Post-Modification Recorded Investment |  |  | 3,731
Commercial and industrial |  |  |
Troubled debt restructurings |  |  |
Number of loans | loans |  | 2 |
Pre-Modification Recorded Investment |  |  | 3,714
Post-Modification Recorded Investment |  |  | 3,714
Other |  |  |
Troubled debt restructurings |  |  |
Number of loans | loans |  | 1 |
Pre-Modification Recorded Investment |  |  | 17
Post-Modification Recorded Investment |  |  | $ 17

X
- Definition Financing Receivable, Modifications, Post-Modification Recorded Investment3 + References No definition available. + Details
Name: | fbiz_FinancingReceivableModificationsPostModificationRecordedInvestment3
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Modifications, Pre-Modification Recorded Investment3 + References No definition available. + Details
Name: | fbiz_FinancingReceivableModificationsPreModificationRecordedInvestment3
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fbiz_CommercialAndIndustrialLoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fbiz_OtherLoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |