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Credit Quality - Additional information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Minimum commercial loan relationships to be reviewed by loan review function | $ 3,000,000 |  |
Restructured loans to borrowers experiencing financial difficulty in excess of | 250,000 |  |
Performing status returned period | 6 months |  |
Allowance for loan losses | 1,830,000 |  | 1,840,000
Interest income recognized on loan restructurings | 149,000 | 240,000 |
Covered Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Accruing loans contractually past due 90 days or more | 109,000 |  | 86,000
PCI loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of impaired loans | 3 |  | 4
Number of loans | 7 |  |
Waccamaw Bank |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00% |  |
Amount of covered loans decreased | $ 2,750,000 |  |
Percentage of covered loans decreased | 6.63% |  |

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- Definition Allowance for loan losses. + References No definition available. + Details
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Namespace Prefix: | fcbc_
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Balance Type: | credit
Period Type: | instant

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- Definition Total commercial loans. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Financing Receivable Covered Loans Net + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Financing Receivable Number Of Loans + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Interest income recognized on loan restructurings. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Loans And Leases Receivable Impaired Number Of Loans + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:integerItemType
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- Definition Percentage of Covered Loans + References No definition available. + Details
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- Definition Percentage of loss covered by FDIC. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Performing status returned period. + References No definition available. + Details
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Namespace Prefix: | fcbc_
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Period Type: | duration

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- Definition Restructured loans reserves. + References No definition available. + Details
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Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + Details
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