XML 63 R53.htm IDEA: XBRL DOCUMENT
v3.19.1

Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables [Abstract] |  |
Unguaranteed Portion of Sold SBA loans Retained | $ 23,403 | $ 23,898
Other SBA Loans | 22,880 | 22,024
Small Business Administration Loans | $ 46,283 | $ 45,922

X
- Definition Other SBA Loans, including, but not limited to SBA Express Loans and partially funding 7(a) program loans. + References No definition available. + Details
Name: | fbiz_OtherSBALoans
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Small Business Administration Loans on the balance sheet. + References No definition available. + Details
Name: | fbiz_SmallBusinessAdministrationLoans
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unguaranteed Portion of Sold SBA loans Retained on the balance sheet. + References No definition available. + Details
Name: | fbiz_UnguaranteedPortionofSoldSBAloansRetained
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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