XML 102 R88.htm IDEA: XBRL DOCUMENT v3.24.0.1

Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deposit [Line Items]
Deposits	$ 2,796,779	$ 2,168,206
Deposits, average balance	$ 2,444,438	$ 1,977,640
Deposits, average rate	2.92%	0.67%
Non-interest-bearing transaction accounts
Deposit [Line Items]
Deposits	$ 445,376	$ 537,107
Deposits, average balance	$ 453,930	$ 566,230
Deposits, average rate	0.00%	0.00%
Interest-bearing transaction accounts
Deposit [Line Items]
Deposits	$ 895,319	$ 576,601
Deposits, average balance	$ 689,500	$ 503,668
Deposits, average rate	3.44%	0.79%
Money market accounts
Deposit [Line Items]
Deposits	$ 711,245	$ 698,505
Deposits, average balance	$ 681,336	$ 761,469
Deposits, average rate	3.25%	0.82%
Certificates of deposit
Deposit [Line Items]
Deposits	$ 287,131	$ 153,757
Deposits, average balance	$ 273,387	$ 97,448
Deposits, average rate	4.10%	1.39%
Wholesale deposits
Deposit [Line Items]
Deposits	$ 457,708	$ 202,236
Deposits, average balance	$ 346,285	$ 48,825
Deposits, average rate	4.14%	3.31%

X

- Definition

Average Balance, Deposits

+ References

No definition available.

+ Details

Name:	fbiz_AverageBalanceDeposits
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

[Line Items] for Deposit [Table]

+ References

No definition available.

+ Details

Name:	fbiz_DepositLineItems
Namespace Prefix:	fbiz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Deposits, Weighted Average Interest Rate During the Period

+ References

No definition available.

+ Details

Name:	fbiz_DepositsWeightedAverageInterestRateDuringthePeriod
Namespace Prefix:	fbiz_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_Deposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	fbiz_DepositTypeAxis=fbiz_NoninterestbearingTransactionAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fbiz_DepositTypeAxis=fbiz_InterestbearingTransactionAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fbiz_DepositTypeAxis=fbiz_MoneyMarketAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fbiz_DepositTypeAxis=fbiz_NonbrokeredCertificatesofDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fbiz_DepositTypeAxis=fbiz_BrokeredCertificatesofDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: