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Note 15 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 3 [Member]
Financial assets measured at fair value	$ 691
Financial assets measured at fair value	3,343
Assets held for sale	228
Fair Value, Measurements, Nonrecurring [Member]
Financial assets measured at fair value	691	$ 694
Financial assets measured at fair value	3,343	3,792
Assets held for sale	228	228
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets measured at fair value
Financial assets measured at fair value
Assets held for sale
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets measured at fair value
Financial assets measured at fair value
Assets held for sale
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets measured at fair value	691	694
Financial assets measured at fair value	3,343	3,792
Assets held for sale	$ 228	$ 228

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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Period Type:	instant

X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

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- Details

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