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Fair Value Disclosures (Fair Value by Balance Sheet Groupings) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Financial assets: |  |  |  |
Cash and cash equivalents, carrying amount | $ 141,887 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 103,237 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 76,396 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 81,286 us-gaap_CashAndCashEquivalentsAtCarryingValue
Securities available-for-sale, carrying amount | 142,951 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 144,698 us-gaap_AvailableForSaleSecuritiesDebtSecurities |  |
Securities held-to-maturity, carrying value | 40,599 us-gaap_HeldToMaturitySecurities | 41,563 us-gaap_HeldToMaturitySecurities |  |
Loans and leases receivable, net amount, carrying amount | 1,279,846 us-gaap_LoansAndLeasesReceivableNetReportedAmount | 1,265,098 us-gaap_LoansAndLeasesReceivableNetReportedAmount |  |
Federal Home Loan Bank stock, carrying amount | 2,798 us-gaap_FederalHomeLoanBankStock | 2,340 us-gaap_FederalHomeLoanBankStock |  |
Cash surrender value of life insurance, carrying amount | 27,548 us-gaap_BankOwnedLifeInsurance | 27,314 us-gaap_BankOwnedLifeInsurance |  |
Accrued interest receivable, carrying amount | 4,146 us-gaap_InterestReceivable | 3,932 us-gaap_InterestReceivable |  |
Interest rate swaps - assets, carrying amount | 956 us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue | 575 us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue |  |
Cash and cash equivalents, fair value | 141,887 us-gaap_CashAndCashEquivalentsFairValueDisclosure | 103,227 us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Securities available-for-sale, fair value | 142,951 us-gaap_AvailableForSaleSecurities | 144,698 us-gaap_AvailableForSaleSecurities |  |
Loans held-for-sale | 2,396 us-gaap_LoansReceivableHeldForSaleAmount | 1,340 us-gaap_LoansReceivableHeldForSaleAmount |  |
Held-to-maturity Securities, fair value | 41,147 us-gaap_HeldToMaturitySecuritiesFairValue | 41,694 us-gaap_HeldToMaturitySecuritiesFairValue |  |
Loans and lease receivables, net, fair value | 1,310,067 us-gaap_LoansReceivableFairValueDisclosure | 1,285,162 us-gaap_LoansReceivableFairValueDisclosure |  |
Federal Home Loan Bank stock, fair value | 2,798 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure | 2,340 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure |  |
Cash surrender value of life insurance, fair value | 27,548 us-gaap_CashSurrenderValueFairValueDisclosure | 27,314 us-gaap_CashSurrenderValueFairValueDisclosure |  |
Accrued interest receivable, fair value | 4,146 fbiz_AccruedInterestReceivableFairValueDisclosure | 3,932 fbiz_AccruedInterestReceivableFairValueDisclosure |  |
Interest rate swaps - assets, fair value | 956 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure | 575 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure |  |
Financial liabilities: |  |  |  |
Deposits, carrying amount | 1,485,801 us-gaap_Deposits | 1,438,268 us-gaap_Deposits |  |
Federal Home Loan Bank and other borrowings, carrying amount | 34,448 fbiz_FederalHomeLoanBankAndOtherBorrowings | 33,994 fbiz_FederalHomeLoanBankAndOtherBorrowings |  |
Junior subordinated notes, carrying amount | 10,315 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust | 10,315 us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust |  |
Interest rate swaps - liabilities, carrying amount | 956 us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue | 575 us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue |  |
Accrued interest payable, carrying amount | 1,744 us-gaap_InterestPayableCurrentAndNoncurrent | 1,574 us-gaap_InterestPayableCurrentAndNoncurrent |  |
Standby letters of credit, carrying amount | 128 us-gaap_LettersOfCreditOutstandingAmount | 192 us-gaap_LettersOfCreditOutstandingAmount |  |
Commitments to extend credit, carrying amount | 0 fbiz_CommitmentstoExtendCreditCarryingAmount | 0 fbiz_CommitmentstoExtendCreditCarryingAmount |  |
Deposits, fair value | 1,489,399 us-gaap_DepositsFairValueDisclosure | 1,440,248 us-gaap_DepositsFairValueDisclosure |  |
Federal Home Loan Bank and other borrowings fair value | 35,080 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure | 34,590 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure |  |
Junior subordinated notes, fair value | 7,086 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations | 7,101 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations |  |
Interest rate swaps - liabilities, fair value | 956 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure | 575 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure |  |
Accrued interest payable, fair value | 1,744 us-gaap_AccruedLiabilitiesFairValueDisclosure | 1,574 us-gaap_AccruedLiabilitiesFairValueDisclosure |  |
Standby letters of credit, fair value | 128 fbiz_StandbyLettersOfCreditFairValueDisclosure | 192 fbiz_StandbyLettersOfCreditFairValueDisclosure |  |
Fair Value Measurements - Level 1 Inputs |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents, fair value | 120,127 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 85,937 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Securities available-for-sale, fair value | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Loans held-for-sale | 0 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Held-to-maturity Securities, fair value | 0 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Loans and lease receivables, net, fair value | 0 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Federal Home Loan Bank stock, fair value | 0 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Cash surrender value of life insurance, fair value | 27,548 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 27,314 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Accrued interest receivable, fair value | 4,146 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,932 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Interest rate swaps - assets, fair value | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Financial liabilities: |  |  |  |
Deposits, fair value | 939,576 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 884,292 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Federal Home Loan Bank and other borrowings fair value | 0 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Junior subordinated notes, fair value | 0 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Interest rate swaps - liabilities, fair value | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Accrued interest payable, fair value | 1,744 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,574 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Standby letters of credit, fair value | 0 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Fair Value Measurements - Level 2 Inputs |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents, fair value | 6,410 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 6,890 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Securities available-for-sale, fair value | 142,951 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 144,698 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Loans held-for-sale | 2,396 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,340 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Held-to-maturity Securities, fair value | 41,147 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 41,694 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Loans and lease receivables, net, fair value | 6,739 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 7,025 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Federal Home Loan Bank stock, fair value | 0 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Cash surrender value of life insurance, fair value | 0 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Accrued interest receivable, fair value | 0 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Interest rate swaps - assets, fair value | 956 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 575 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Financial liabilities: |  |  |  |
Deposits, fair value | 549,823 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 555,956 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Federal Home Loan Bank and other borrowings fair value | 35,080 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 34,590 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Junior subordinated notes, fair value | 0 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Interest rate swaps - liabilities, fair value | 956 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 575 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Accrued interest payable, fair value | 0 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Standby letters of credit, fair value | 0 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Fair Value Measurements - Level 3 Inputs |  |  |  |
Financial assets: |  |  |  |
Cash and cash equivalents, fair value | 15,350 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 10,400 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Securities available-for-sale, fair value | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Loans held-for-sale | 0 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_LoansReceivableHeldForSaleAmount / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Held-to-maturity Securities, fair value | 0 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Loans and lease receivables, net, fair value | 1,303,328 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 1,278,137 us-gaap_LoansReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Federal Home Loan Bank stock, fair value | 2,798 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,340 us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Cash surrender value of life insurance, fair value | 0 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_CashSurrenderValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Accrued interest receivable, fair value | 0 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 fbiz_AccruedInterestReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Interest rate swaps - assets, fair value | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Financial liabilities: |  |  |  |
Deposits, fair value | 0 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_DepositsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Federal Home Loan Bank and other borrowings fair value | 0 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 fbiz_FederalHomeLoanBankAndOtherBorrowingsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Junior subordinated notes, fair value | 7,086 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 7,101 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Interest rate swaps - liabilities, fair value | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 fbiz_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValueFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Accrued interest payable, fair value | 0 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_AccruedLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Standby letters of credit, fair value | $ 128 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 192 fbiz_StandbyLettersOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |

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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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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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- Definition Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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