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Deposits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Deposits [Line Items]
Deposits	$ 1,485,801us-gaap_Deposits	$ 1,438,268us-gaap_Deposits
Deposits, weighted average balance	1,482,021fbiz_WeightedAverageBalanceDeposits	1,208,003fbiz_WeightedAverageBalanceDeposits
Deposits, weighted average interest rate during the period	0.69%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod	0.78%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod
Non-interest-bearing transaction accounts
Deposits [Line Items]
Deposits	194,277us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember	204,328us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember
Deposits, weighted average balance	200,274fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember	154,687fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember
Deposits, weighted average interest rate during the period	0.00%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember	0.00%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember
Interest-bearing transaction accounts
Deposits [Line Items]
Deposits	102,739us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember	104,199us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember
Deposits, weighted average balance	107,311fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember	83,508fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember
Deposits, weighted average interest rate during the period	0.22%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember	0.22%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember
Money market accounts
Deposits [Line Items]
Deposits	642,560us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember	575,766us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember
Deposits, weighted average balance	625,888fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember	493,322fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember
Deposits, weighted average interest rate during the period	0.55%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember	0.52%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember
Certificates of deposit
Deposits [Line Items]
Deposits	115,252us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember	126,635us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember
Deposits, weighted average balance	124,377fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember	60,284fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember
Deposits, weighted average interest rate during the period	0.71%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember	0.89%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember
Wholesale deposits
Deposits [Line Items]
Deposits	430,973us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember	427,340us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember
Deposits, weighted average balance	$ 424,171fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember	$ 416,202fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember
Deposits, weighted average interest rate during the period	1.36%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember	1.49%fbiz_DepositsWeightedAverageInterestRateDuringthePeriod / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ 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 210.9-03.12)

-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 12

-Article 9

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