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Employee Benefit Plans (Bank Owned Life Insurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Bank owned life insurance [Line Items]
Bank-owned life insurance	$ 52,188	$ 42,761
Bank owned life insurance death benefits	136,100	97,900
Insured executive officers with deferred compensation plans
Bank owned life insurance [Line Items]
Bank-owned life insurance	2,700	2,600
Bank owned life insurance death benefits	6,000	6,000
Other insured individuals
Bank owned life insurance [Line Items]
Bank-owned life insurance	$ 49,500	$ 40,200

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- Definition

Bank Owned Life Insurance Death Benefits

+ References

No definition available.

+ Details

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Namespace Prefix:	fbiz_
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Balance Type:	debit
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X

- Definition

[Line Items] for Bank owned life insurance [Table]

+ References

No definition available.

+ Details

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

X

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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