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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
SBA 7(a) loans	$ 40,402	$ 44,201
SBA 504 Loans	20,592	10,574
SBA Express Loans	1,781	1,721
SBA Loans	$ 62,775	$ 56,496

X

- Definition

Small Business Administration 504 Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Small Business Administration 7(a) Loans

+ References

No definition available.

+ Details

Name:	fbiz_SmallBusinessAdministration7aLoans
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Small Business Administration Express Loans

+ References

No definition available.

+ Details

Name:	fbiz_SmallBusinessAdministrationExpressLoans
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Small Business Administration Loans on the balance sheet.

+ References

No definition available.

+ Details

Name:	fbiz_SmallBusinessAdministrationLoans
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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