XML 69 R59.htm IDEA: XBRL DOCUMENT v3.10.0.1

Deposits (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Deposits [Line Items]
Deposits	$ 1,337,725	$ 1,394,331
Average balance, deposits	$ 1,380,520	$ 1,459,067
Deposits, weighted average interest rate during the period	0.87%	0.74%
Non-interest-bearing transaction accounts
Deposits [Line Items]
Deposits	$ 255,521	$ 277,445
Average balance, deposits	$ 234,487	$ 230,907
Deposits, weighted average interest rate during the period	0.00%	0.00%
Interest-bearing transaction accounts
Deposits [Line Items]
Deposits	$ 272,057	$ 217,625
Average balance, deposits	$ 285,216	$ 226,540
Deposits, weighted average interest rate during the period	0.73%	0.59%
Money market accounts
Deposits [Line Items]
Deposits	$ 450,654	$ 515,077
Average balance, deposits	$ 494,779	$ 583,241
Deposits, weighted average interest rate during the period	0.78%	0.47%
Certificates of deposit
Deposits [Line Items]
Deposits	$ 78,062	$ 76,199
Average balance, deposits	$ 76,424	$ 56,667
Deposits, weighted average interest rate during the period	1.25%	1.00%
Wholesale deposits
Deposits [Line Items]
Deposits	$ 281,431	$ 307,985
Average balance, deposits	$ 289,614	$ 361,712
Deposits, weighted average interest rate during the period	1.80%	1.70%

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:	num: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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ 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: