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Note 3 - Acquisition Activity - Loans Acquired (Details) $ in Thousands	Aug. 31, 2018 USD ($)
Purchased performing loans	$ 151,746
Purchased credit impaired loans	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

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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

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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

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Namespace Prefix:	fusb_
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- Definition

The amount of total purchased loans in a business combination.

+ References

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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=116869197&loc=d3e4845-128472

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- 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=118939070&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=118938799&loc=d3e13503-111538

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