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Employee Benefit Plans (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Bank owned life insurance [Line Items]
Cash surrender value of bank-owned life insurance	$ 23,142,000	$ 22,272,000
Bank owned life insurance death benefits	57,400,000
Insured executive officers with deferred compensation plans
Bank owned life insurance [Line Items]
Cash surrender value of bank-owned life insurance	2,000,000	1,900,000
Bank owned life insurance death benefits	5,700,000	5,700,000
Other insured individuals
Bank owned life insurance [Line Items]
Cash surrender value of bank-owned life insurance	$ 21,100,000	$ 20,400,000

X

- Definition

Bank Owned Life Insurance Death Benefits

+ References

No definition available.

+ Details

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

X

- Details

Name:	fbiz_BankOwnedLifeInsuranceLineItems
Namespace Prefix:	fbiz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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