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Note 2 - Acquisitions (Details Textual) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 11, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Provision for Loan and Lease Losses, Total		$ 4,703	$ 675	$ 12,034	$ 3,480
Highlands Bankshares, Inc. [Member]
Business Combination, Stock Conversion Ratio	0.2703
Business Combination, Consideration Transferred, Total	$ 86,647
Acquired Loan, Fair Value Adjustments	(14,700)
Deferred Loan Fees Excluded from Fair Value Adjustment of Acquired Loan	3,270
Death Benefits Payable, Fair Value Adjustment	320
Lease Liability, Fair Value Adjustment	(37)
Reserve for Unfunded Commitments, Fair Value Adjustment	$ (85)
Business Combination, Acquisition Related Costs				$ 1,890
Provision for Loan and Lease Losses, Total			$ 548		$ 1,490

X

- Definition

The increase (decrease) to acquired loan related to the fair value adjustments.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The stock conversion ratio for a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcbc_
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Balance Type:	na
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X

- Definition

The increase (decrease) to death benefits payable related to the fair value adjustment.

+ References

No definition available.

+ Details

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X

- Definition

The amount of deferred loan fees that excluded from the fair value adjustment of acquired loan.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) to lease liability related to the fair value adjustment.

+ References

No definition available.

+ Details

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X

- Definition

The increase (decrease) to reserve for unfunded commitments related to the fair value adjustment.

+ References

No definition available.

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Namespace Prefix:	fcbc_
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
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-SubTopic 10
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