XML 78 R69.htm IDEA: XBRL DOCUMENT
v3.22.2

Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Deposits |  |
Deposits, carrying amount | $ 1,869,331 | $ 1,957,923
Wholesale Certificates of Deposit |  |
Deposits |  |
Deposits, carrying amount | 12,300 | 19,600
Non-Reciprocal Interest-Bearing Transaction Accounts |  |
Deposits |  |
Deposits, carrying amount | 0 | 10,000
Certificates of Deposits and Wholesale Deposits |  |
Deposits |  |
Time Deposits, $250,000 or More | $ 25,300 | $ 7,900

X
- Definition [Line Items] for Deposit [Table] + References No definition available. + Details
Name: | fbiz_DepositLineItems
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Time Deposits, $250,000 or More + References No definition available. + Details
Name: | fbiz_TimeDeposits250000orMore
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_WholesaleCertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_NonReciprocalInterestBearingTransactionAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fbiz_DepositTypeAxis=fbiz_CertificatesOfDepositsAndWholesaleDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |