XML 71 R61.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Note 14 - Guarantees, Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Standby Letters of Credit [Member] |  |
Commitments and contingent liabilities | $ 183 | $ 183
Commitments to Extend Credit [Member] |  |
Commitments and contingent liabilities | $ 43,806 | $ 41,267

X
- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=fusb_CommitmentsToExtendCredit1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |