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Fair Value Disclosures (Foreclosed Properties) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Repossessed Assets Acquired in Acquisitions, Fair Value	$ 0fbiz_RepossessedAssetsAcquiredinAcquisitionsFairValue		$ 1,605fbiz_RepossessedAssetsAcquiredinAcquisitionsFairValue
Foreclosed properties at the beginning of the period	1,693us-gaap_ForeclosedAssets	333us-gaap_ForeclosedAssets	333us-gaap_ForeclosedAssets
Proceeds from sale of foreclosed properties	(143)us-gaap_ProceedsFromSaleOfForeclosedAssets	0us-gaap_ProceedsFromSaleOfForeclosedAssets	(255)us-gaap_ProceedsFromSaleOfForeclosedAssets
Net Gains (Losses) on Other Real Estate	16fbiz_NetGainsLossesOnOtherRealEstate		14fbiz_NetGainsLossesOnOtherRealEstate
Gains (Losses) on Sales of Other Real Estate	16us-gaap_GainsLossesOnSalesOfOtherRealEstate	0us-gaap_GainsLossesOnSalesOfOtherRealEstate
Impairment valuation	0us-gaap_ImpairmentOfRealEstate		(4)us-gaap_ImpairmentOfRealEstate
Foreclosed properties at the end of the period	$ 1,566us-gaap_ForeclosedAssets		$ 1,693us-gaap_ForeclosedAssets

X

- Definition

Net Gains (Losses) on Other Real Estate

+ References

No definition available.

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- Definition

The fair value of repossessed assets acquired in an acquisition of a company.

+ References

No definition available.

+ Details

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- Details

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- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

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X

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 14

-Subparagraph d

-Article 9

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- Definition

The charge against earnings in the period to reduce the carrying amount of real property to fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

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- Definition

The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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