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Note 3 - Acquisition Activity - Loans Acquired (Details) - USD ($) $ in Thousands | Aug. 31, 2018 | Sep. 01, 2018
--- | --- | ---
Purchased performing loans |  | $ 151,746
Purchased credit impaired loans | $ 2,800 | 2,831
Total purchased loans |  | $ 154,577
The Peoples Bank [Member] |  |
Purchased performing loans | 153,862 |
Purchased performing loans, fair value adjustments | (2,116) |
Purchased credit impaired loans | 2,910 |
Purchased credit impaired loans, fair value adjustments | (79) |
Total purchased loans | 156,772 |
Total purchased loans, fair value adjustments | $ (2,195) |

X
- Definition This element represents the amount of any measurement period adjustment (As defined) Realized during the reporting period to purchased credit impaired loans acquired in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
Name: | fusb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPurchasedCreditImpairedLoans
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of any measurement period adjustment (As defined) Realized during the reporting period to purchased performing loans acquired in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
Name: | fusb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPurchasedPerformingLoans
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of any measurement period adjustment (As defined) Realized during the reporting period to total purchased loans acquired in connection with a business combination for which the initial accounting was incomplete. + References No definition available. + Details
Name: | fusb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentTotalPurchasedLoans
Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of total purchased loans in a business combination. + References No definition available. + Details
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Namespace Prefix: | fusb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |