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Note 5 - Loans and Leases and Allowance for Loan Losses - Acquired Loans (Details) (Parentheticals) $ in Thousands | Sep. 30, 2018 USD ($)
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Carrying amount, fair value adjustment | $ 278

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