XML 65 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1

Note 1 - Description of Business (Details Textual)	12 Months Ended
	Dec. 31, 2017
Number of Operating Banking Offices	16

X

- Definition

Represents the number of banking offices.

+ References

No definition available.

+ Details

Name:	fusb_NumberOfOperatingBankingOffices
Namespace Prefix:	fusb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration