XML 39 R93.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

FHLB Advances, Other Borrowings and Junior Subordinated Notes (Composition of Borrowed Funds) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 329,429	$ 308,977
Borrowed Funds, Average Balance	$ 321,740	$ 308,943
Borrowed funds, interest rate during period	2.87%	2.72%
Long-term borrowings
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 210,929	$ 172,477
Short-term borrowings
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	118,500	136,500
Federal funds purchased
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	0	0
Borrowed Funds, Average Balance	$ 59	$ 119
Borrowed funds, interest rate during period	2.45%	2.43%
FHLB advances
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 295,000	$ 274,500
Borrowed Funds, Average Balance	$ 286,464	$ 274,382
Borrowed funds, interest rate during period	2.17%	2.06%
Line of credit
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 0	$ 0
Borrowed Funds, Average Balance	$ 0	$ 3
Borrowed funds, interest rate during period	0.00%	4.47%
Other borrowings
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 675	$ 675
Borrowed Funds, Average Balance	$ 675	$ 675
Borrowed funds, interest rate during period	8.11%	7.94%
Subordinated notes payable(1)
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 23,707	$ 23,769
Borrowed Funds, Average Balance	$ 24,502	$ 23,739
Borrowed funds, interest rate during period	7.45%	6.64%
Junior subordinated notes
Composition of Borrowed Funds [Line Items]
Junior subordinated notes and other borrowings	$ 10,047	$ 10,033
Borrowed Funds, Average Balance	$ 10,040	$ 10,025
Borrowed funds, interest rate during period	11.08%	11.10%

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LongTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_ShortTermDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: