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

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- 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