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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	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Unguaranteed Portion of Sold SBA loans Retained	$ 23,403	$ 23,898
Other SBA Loans	22,880	22,024
Small Business Administration Loans	$ 46,283	$ 45,922

X

- Definition

Other SBA Loans, including, but not limited to SBA Express Loans and partially funding 7(a) program loans.

+ References

No definition available.

+ Details

Name:	fbiz_OtherSBALoans
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

- Definition

Unguaranteed Portion of Sold SBA loans Retained on the balance sheet.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration