XML 79 R73.htm IDEA: XBRL DOCUMENT
v3.24.3

FHLB Advances, Other Borrowings and Subordinated Notes and Debentures - Composition of Borrowed Funds (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 13, 2024 | Aug. 15, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 349,109 | $ 330,916
Borrowed funds, average balance |  |  | $ 336,316 | $ 390,881
Borrowed funds, interest rate during period |  |  | 3.23% | 2.79%
Federal Funds Purchased |  |  |  |
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 0 | $ 0
Borrowed funds, average balance |  |  | $ 2 | $ 3
Borrowed funds, interest rate during period |  |  | 6.31% | 5.37%
FHLB Advances |  |  |  |
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 294,450 | $ 281,500
Borrowed funds, average balance |  |  | $ 286,454 | $ 351,990
Borrowed funds, interest rate during period |  |  | 2.68% | 2.52%
Line of Credit |  |  |  |
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 0 | $ 0
Borrowed funds, average balance |  |  | $ 1,642 | $ 38
Borrowed funds, interest rate during period |  |  | 7.76% | 7.26%
Other Borrowings |  |  |  |
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 0 | $ 20
Borrowed funds, average balance |  |  | $ 10 | $ 600
Borrowed funds, interest rate during period |  |  | 0.00% | 8.33%
Subordinated Notes and Debentures |  |  |  |
Composition of Borrowed Funds |  |  |  |
Borrowed funds |  |  | $ 54,659 | $ 49,396
Borrowed funds, average balance |  |  | $ 48,208 | $ 38,250
Borrowed funds, interest rate during period | 7.50% | 5.50% | 6.37% | 5.16%

X
- Definition Borrowed Funds, Average Balance + References No definition available. + Details
Name: | fbiz_BorrowedFundsAverageBalance
Namespace Prefix: | fbiz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition [Line Items] for Composition of Borrowed Funds [Table] + References No definition available. + Details
Name: | fbiz_CompositionofBorrowedFundsLineItems
Namespace Prefix: | fbiz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of short-term and long-term debt and lease obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The average effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-2 + Details
Name: | us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_FederalFundsPurchasedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=fbiz_FHLBadvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=fbiz_OtherBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |