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Leases (Narrative Disclosures) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Lease liabilities | $ 9,499 | $ 10,175
Kansas City Metropolitan |  |
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 |

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- Definition Right-of-Use Asset Obtained in Exchange for Operating Lease Liability, New Operating Leases During the Year + References No definition available. + Details
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Namespace Prefix: | fbiz_
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- Definition Tenant Improvement Allowance Recognized as a Lease Incentive + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
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- 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
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Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |