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Employee Benefit Plans (Bank Owned Life Insurance) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Bank owned life insurance [Line Items] |  |
Bank-owned life insurance | $ 42,761 | $ 41,538
Bank owned life insurance death benefits | 97,900 | 97,800
Insured executive officers with deferred compensation plans |  |
Bank owned life insurance [Line Items] |  |
Bank-owned life insurance | 2,600 | 2,500
Bank owned life insurance death benefits | 6,000 | 5,900
Other insured individuals |  |
Bank owned life insurance [Line Items] |  |
Bank-owned life insurance | $ 40,200 | $ 39,000

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- Definition Bank Owned Life Insurance Death Benefits + References No definition available. + Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition [Line Items] for Bank owned life insurance [Table] + References No definition available. + Details
Name: | fbiz_BankOwnedLifeInsuranceLineItems
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + 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 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_BankOwnedLifeInsurance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | fbiz_BankOwnedLifeInsuranceInsuredAxis=fbiz_OtherInsuredIndividualsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |