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Employee Benefit Plans (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
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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

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- Definition Bank Owned Life Insurance Death Benefits + References No definition available. + Details
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- Details
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Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- 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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