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FHLB Advances, Other Borrowings and Junior Subordinated Notes Payable (Composition of Borrowed Funds) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Composition of Borrowed Funds [Line Items]
Borrowed funds	$ 18,251	$ 22,251
Borrowed funds, weighted average balance	22,073	28,982
Borrowed funds, interest rate during period	7.84%	6.78%
Long-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	18,241	22,241
Short-term borrowings
Composition of Borrowed Funds [Line Items]
Borrowed funds	10	10
Federal funds purchased
Composition of Borrowed Funds [Line Items]
Borrowed funds	0	0
Borrowed funds, weighted average balance	0	260
Borrowed funds, interest rate during period	0.00%	0.74%
FHLB advances
Composition of Borrowed Funds [Line Items]
Borrowed funds	0	0
Borrowed funds, weighted average balance	3,111	6,471
Borrowed funds, interest rate during period	0.16%	0.19%
Line of credit
Composition of Borrowed Funds [Line Items]
Borrowed funds	10	10
Borrowed funds, weighted average balance	10	10
Borrowed funds, interest rate during period	3.25%	3.41%
Subordinated notes payable
Composition of Borrowed Funds [Line Items]
Borrowed funds	7,926	11,926
Borrowed funds, weighted average balance	8,637	11,926
Borrowed funds, interest rate during period	7.13%	6.92%
Junior subordinated notes
Composition of Borrowed Funds [Line Items]
Borrowed funds	10,315	10,315
Borrowed funds, weighted average balance	$ 10,315	$ 10,315
Borrowed funds, interest rate during period	10.63%	10.78%

X

- Definition

Borrowed Funds, Weighted Average Balance

+ References

No definition available.

+ Details

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Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Details

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X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, collateralized financings, and capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_BorrowedFunds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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