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Deposit Transactions with Related Parties (Detail) (Related Party, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Beginning balance | $ 2,589 | $ 3,837 | $ 17,114
Increase in deposits, including new accounts | 907 | 311 | 1,294
Decrease in deposits, including closed accounts | (574) | (1,559) | (14,571)
Ending balance | $ 2,922 | $ 2,589 | $ 3,837

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- Definition Interest Bearing Deposit Liabilities, New Account Deposits + References No definition available. + Details
Name: | fcbc_InterestBearingDepositLiabilitiesNewAccountDeposits
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration