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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 | $ 1,485,801 us-gaap_Deposits | $ 1,438,268 us-gaap_Deposits
Deposits, weighted average balance | 1,482,021 fbiz_WeightedAverageBalanceDeposits | 1,208,003 fbiz_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 | 194,277 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember | 204,328 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember
Deposits, weighted average balance | 200,274 fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NoninterestbearingTransactionAccountsMember | 154,687 fbiz_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 | 102,739 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember | 104,199 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember
Deposits, weighted average balance | 107,311 fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_InterestbearingTransactionAccountsMember | 83,508 fbiz_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 | 642,560 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember | 575,766 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember
Deposits, weighted average balance | 625,888 fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_MoneyMarketAccountsMember | 493,322 fbiz_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 | 115,252 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember | 126,635 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember
Deposits, weighted average balance | 124,377 fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_NonbrokeredCertificatesofDepositMember | 60,284 fbiz_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 | 430,973 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember | 427,340 us-gaap_Deposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember
Deposits, weighted average balance | $ 424,171 fbiz_WeightedAverageBalanceDeposits / fbiz_DepositTypeAxis = fbiz_BrokeredCertificatesofDepositMember | $ 416,202 fbiz_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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- Definition 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 + Details
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