XML 97 R83.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Leases (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Leases [Abstract] |  |
Lease liabilities | $ 8,954 | $ 10,175
Lease liabilities | 8,954 | $ 10,175
Kansas City Metropolitan |  |
Leases [Abstract] |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year | 2,600 |
Lease liabilities | 3,700 |
Tenant Improvement Allowance Recognized as a Lease Incentive | 1,100 |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year | 2,600 |
Lease liabilities | 3,700 |
Tenant Improvement Allowance Recognized as a Lease Incentive | $ 1,100 |

X
- Definition Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year + References No definition available. + Details
Name: | fbiz_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityNewOperatingLeasesDuringTheYear
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=fbiz_KansasCityMetropolitanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |