XML 73 R64.htm IDEA: XBRL DOCUMENT
v3.22.1

Leases (Narrative Disclosures) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($)
Leases [Abstract] |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | $ 1,600
Tenant Improvement Allowance Recognized as a Lease Incentive | $ 991

X
- Definition Tenant Improvement Allowance Recognized as a Lease Incentive + References No definition available. + Details
Name: | fbiz_TenantImprovementAllowanceRecognizedAsALeaseIncentive
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
Name: | us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration