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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Receivables [Abstract] |  |
SBA 7(a) loans | $ 32,927 | $ 33,223
SBA 504 Loans | 38,569 | 41,394
SBA Express Loans and lines of credit | 233 | 387
SBA PPP loans | 8,285 | 27,854
Total SBA loans | $ 80,014 | $ 102,858

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- Definition Small Business Administration 504 Loans + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Small Business Administration 7(a) Loans + References No definition available. + Details
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- Definition Small Business Administration Express Loans + 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 Small Business Administration Loans on the balance sheet. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Small Business Administration Paycheck Protection Program Loans + 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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- References No definition available. + Details
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