XML 128 R115.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value (Measured on a Non-Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired loans |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | $ 15,147 | $ 13,365
Impaired loans | Fair Value Measurements - Level 1 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 0 | 0
Impaired loans | Fair Value Measurements - Level 2 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 10,063 | 12,268
Impaired loans | Fair Value Measurements - Level 3 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 5,084 | 1,097
Foreclosed properties |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 1,069 | 1,472
Foreclosed properties | Fair Value Measurements - Level 1 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 0 | 0
Foreclosed properties | Fair Value Measurements - Level 2 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | 1,069 | 1,472
Foreclosed properties | Fair Value Measurements - Level 3 Inputs |  |
Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis |  |
Assets measured on a non-recurring basis, fair value | $ 0 | $ 0

X
- Definition Fair Value, Assets and Liabilities Measured on a Nonrecurring Basis [Line Items] + References No definition available. + Details
Name: | fbiz_FairValueAssetsAndLiabilitiesMeasuredOnNonrecurringBasisLineItems
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=fbiz_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=fbiz_ForeclosedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |