XML 90 R105.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2

Employee Benefit Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined contribution maximum annual matching contribution per employee, percent	3.00%
Defined contribution maximum annual discretionary contribution per employee, percent	6.00%
Defined contribution plan, employer matching contribution, percent	3.00%
Defined contribution plan employer matching contribution	$ 783,000	$ 700,000
Defined contribution plan employer discretionary contribution percent	4.10%	1.00%
Defined contribution plan, employer discretionary contribution amount	$ 808,000	$ 180,000
Deferred compensation plan compensation expense	168,000	150,000
Present value of future payments under the remaining deferred compensation plan liability	$ 1,400,000	$ 1,300,000

X

- Definition

Defined Contribution Maximum Annual Discretionary Contribution Per Employee, Percent

+ References

No definition available.

+ Details

Name:	fbiz_DefinedContributionMaximumAnnualDiscretionaryContributionPerEmployeePercent
Namespace Prefix:	fbiz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Maximum Annual Matching Contribution Per Employee, Percent

+ References

No definition available.

+ Details

Name:	fbiz_DefinedContributionMaximumAnnualMatchingContributionPerEmployeePercent
Namespace Prefix:	fbiz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Plan Employer Discretionary Contribution Percent

+ References

No definition available.

+ Details

Name:	fbiz_DefinedContributionPlanEmployerDiscretionaryContributionPercent
Namespace Prefix:	fbiz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Contribution Plan Employer Matching Contribution, Amount

+ References

No definition available.

+ Details

Name:	fbiz_DefinedContributionPlanEmployerMatchingContribution
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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