XML 71 R51.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Note 1 - Description of Business (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2016
Number of Operating Banking Offices | 15

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