XML 127 R113.htm IDEA: XBRL DOCUMENT v3.24.0.1

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Accrued credit losses for financial instruments with off-balance-sheet risk	$ 0	$ 0
SBA Loans, Probability of Future Losses	$ 955	$ 441

X

- Definition

Accrued Credit Losses for Financial Instruments with Off-balance-sheet Risk

+ References

No definition available.

+ Details

Name:	fbiz_AccruedCreditLossesForFinancialInstrumentsWithOffBalanceSheetRisk
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

SBA Loans, Probability of Future Losses

+ References

No definition available.

+ Details

Name:	fbiz_SBALoansProbabilityofFutureLosses
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration