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Note 14 - Guarantees, Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Credit Losses Associated With Derivative Contracts | $ 0 | $ 0 |
Securities Committed to Purchase Amount | 0 |  | $ 0
Securities Committed to Sell Amount | 0 |  | 0
Self Insurance Reserve | $ 200 |  | $ 200

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- Definition Credit losses associated with derivative contracts. + References No definition available. + Details
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Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Securities committed to purchase amount. + References No definition available. + Details
Name: | fusb_SecuritiesCommittedToPurchaseAmount
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Securities committed to sell amount. + References No definition available. + Details
Name: | fusb_SecuritiesCommittedToSellAmount
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant