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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Net increase in related party deposit	$ 423us-gaap_IncreaseDecreaseInOtherDeposits	$ 574us-gaap_IncreaseDecreaseInOtherDeposits	$ 1,559us-gaap_IncreaseDecreaseInOtherDeposits
Loan to related parties, Increase (decreases)	5,645us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease	564us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease	(1,789)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease
Related party fees	27us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	57us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	63us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Lease expense	1,060us-gaap_OperatingLeasesRentExpenseNet	1,180us-gaap_OperatingLeasesRentExpenseNet	1,260us-gaap_OperatingLeasesRentExpenseNet
Related Parties
Related Party Transaction [Line Items]
Lease expense	92us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember	134us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember	171us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = fcbc_RelatedPartiesMember
Subsidiary Board Members and Executive Officers
Related Party Transaction [Line Items]
Net increase in related party deposit	481us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember	103us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember	166us-gaap_IncreaseDecreaseInOtherDeposits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember
Loan to related parties, Increase (decreases)	$ 5,470us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember	$ (613)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember	$ (2,790)us-gaap_LoansAndLeasesReceivableRelatedPartiesPeriodIncreaseDecrease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = fcbc_ExecutiveAndBoardMemberMember

X

- Definition

Net cash inflow or outflow in all other deposits that have not otherwise been stated in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Reflects the sum for the period of the additions and reductions to related party loans, which when added to the opening balance of related party loan will agree to the ending balance of such loans. This subtotal typically is not reflected.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(e))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph e

-Article 9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Data Type:	na
Balance Type:
Period Type: