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Note 5 - Other Real Estate Owned (Details Textual) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Foreclosed Real Estate Owned, Fair Value Less Disposal Costs	$ 1.1	$ 1.2
Mortgage Loans in Process of Foreclosure, Amount	$ 0.1	$ 0.2

X

- Definition

The fair value less estimated costs to sell of foreclosed residential real estate held by the Company as of the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL49126937-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

+ Details

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