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Note 16 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 3 [Member]
Impaired loans	$ 355
OREO	1,258
Assets held-for-sale	198
Fair Value, Nonrecurring [Member]
Impaired loans	355	$ 665
OREO	1,258	1,505
Assets held-for-sale	198	198
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Impaired loans
OREO
Assets held-for-sale
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Impaired loans
OREO
Assets held-for-sale
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans	355	665
OREO	1,258	1,505
Assets held-for-sale	$ 198	$ 198

X

- Definition

Fair value portion of impaired loans by an entity as a result of past transactions or events.

+ References

No definition available.

+ Details

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Namespace Prefix:	fusb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ 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 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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X

- Details

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- Details

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- Details

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- Details

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