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v3.19.1

Note 5 - Loans and Allowance for Loan Losses - Acquired Loans (Details) (Parentheticals) $ in Thousands | Dec. 31, 2018 USD ($)
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Carrying amount, fair value adjustment | $ 70

X
- Definition Fair value adjustment of loans acquired in a business combination. + References No definition available. + Details
Name: | fusb_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesFairValueAdjustment
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant