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FHLB Advances, Other Borrowings and Junior Subordinated Notes Subordinated notes payable and junior subordinated notes payable (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Jan. 17, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2008
Dec. 31, 2014
Aug. 26, 2014
Dec. 31, 2011
Subordinated Borrowing [Line Items]                
Borrowed funds   $ 44,309,000us-gaap_DebtAndCapitalLeaseObligations $ 22,251,000us-gaap_DebtAndCapitalLeaseObligations     44,309,000us-gaap_DebtAndCapitalLeaseObligations    
Repayment of subordinated notes payable 4,000,000us-gaap_EarlyRepaymentOfSubordinatedDebt 4,000,000us-gaap_EarlyRepaymentOfSubordinatedDebt 0us-gaap_EarlyRepaymentOfSubordinatedDebt 33,289,000us-gaap_EarlyRepaymentOfSubordinatedDebt        
Junior subordinated notes   10,315,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 10,315,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust     10,315,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust    
Debt issuance cost         428,000us-gaap_DebtIssuanceCosts      
Debt issuance costs, unamortized   339,000us-gaap_UnamortizedDebtIssuanceExpense       339,000us-gaap_UnamortizedDebtIssuanceExpense    
Subordinated Debt                
Subordinated Borrowing [Line Items]                
Fixed rate             6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
 
Long-term Debt, Description, Interest Rate Changes   From and including September 1, 2019 to the maturity date, the interest rate shall reset quarterly to an interest rate per annum equal to the then-current three-month LIBOR rate plus 470 basis points, payable quarterly in arrears.            
Long-term Debt, Description, Call Features   The Corporation may, at its option, beginning with the interest payment date of September 1, 2019 and on any interest payment date thereafter, redeem the Notes, in whole or in part at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to the date of redemption. Any partial redemption will be made pro rata among all of the holders. The notes are not subject to repayment at the option of the holders.            
Subordinated Debt Proceeds Used to Pay for Cash Portion of Merger             13,500,000fbiz_SubordinatedDebtProceedsUsedtoPayforCashPortionofMerger
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
 
Subordinated debt - third party financial institution                
Subordinated Borrowing [Line Items]                
Subordinated notes payable   1,700,000us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtThirdPartyFinancialInstitutionMember
      1,700,000us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtThirdPartyFinancialInstitutionMember
  39,000,000us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtThirdPartyFinancialInstitutionMember
Subordinated debt - private placement                
Subordinated Borrowing [Line Items]                
Subordinated notes payable   6,200,000us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtPrivatePlacementMember
      6,200,000us-gaap_SubordinatedDebt
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtPrivatePlacementMember
   
Junior subordinated notes                
Subordinated Borrowing [Line Items]                
Junior subordinated notes   10,315,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
      10,315,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Fixed rate   10.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
      10.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Subordinated debt - private placement                
Subordinated Borrowing [Line Items]                
Subordinated debt, fixed interest rate   7.50%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_SubordinatedBorrowingAxis
= fbiz_SubordinatedDebtPrivatePlacementMember
           
Subordinated Debt                
Subordinated Borrowing [Line Items]                
Borrowed funds   22,926,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
11,926,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
    22,926,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= us-gaap_SubordinatedDebtMember
   
London Interbank Offered Rate (LIBOR) | Subordinated debt - third party financial institution                
Subordinated Borrowing [Line Items]                
Debt instrument, basis spread on variable rate           4.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_SubordinatedBorrowingAxis
= fbiz_SubordinatedDebtThirdPartyFinancialInstitutionMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Interest rate floor debt | Subordinated debt - third party financial institution                
Subordinated Borrowing [Line Items]                
Interest rate floor   6.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_SubordinatedBorrowingAxis
= fbiz_SubordinatedDebtThirdPartyFinancialInstitutionMember
/ us-gaap_VariableRateAxis
= fbiz_InterestRateFloorDebtMember
           
Aslin Group, Inc. | Subordinated Debt - Issued to fund mergers                
Subordinated Borrowing [Line Items]                
Subordinated notes payable             $ 15,000,000us-gaap_SubordinatedDebt
/ us-gaap_BusinessAcquisitionAxis
= fbiz_AslinGroupInc.Member
/ us-gaap_LongtermDebtTypeAxis
= fbiz_SubordinatedDebtIssuedtofundmergersMember