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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 | Sep. 30, 2021 | Dec. 31, 2020
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Receivables [Abstract] |  |
SBA 7(a) loans | $ 30,004 | $ 36,266
SBA 504 Loans | 34,501 | 26,327
SBA Express Loans and lines of credit | 792 | 1,251
SBA PPP loans | 65,904 | 228,870
Total SBA loans | $ 131,201 | $ 292,714

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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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Balance Type: | debit
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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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Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Small Business Administration Paycheck Protection Program Loans + References No definition available. + Details
Name: | fbiz_SmallBusinessAdministrationPaycheckProtectionProgramLoans
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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