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Borrowings - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Weighted average rate of federal funds purchased |  | 0.36%fcbc_WeightedAverageRateOfFederalFundsPurchased
Weighted average rate of retail repurchase agreements | 0.13%fcbc_WeightedAverageRateOfRetailRepurchaseAgreements | 0.38%fcbc_WeightedAverageRateOfRetailRepurchaseAgreements
Federal funds purchased outstanding | $ 0 us-gaap_FederalFundsPurchased | $ 16,000,000 us-gaap_FederalFundsPurchased
FHLB borrowings | 90,000,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm | 150,000,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm
Number of FHLB letters of credit | 2 fcbc_NumberOfFederalHomeLoanBankAdvances |
Letters of credit held to collateralize public unit deposits | 6,180,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments |
Qualifying loans | 981,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1 | 1,130,000,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
Junior subordinated debentures issued | 15,460,000 us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt |
Libor rate | 2.95%us-gaap_LongTermDebtPercentageBearingVariableInterestRate |
Debentures mature date | Oct. 08, 2033 |
Unrelated Financial Institution |  |
Debt Instrument [Line Items] |  |
Unsecured, committed line of credit, outstanding amount | 2,000,000 us-gaap_LineOfCredit / us-gaap_ShortTermDebtTypeAxis = fcbc_FinancialInstitutionMember |
Unsecured, committed line of credit, borrowing capacity | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ShortTermDebtTypeAxis = fcbc_FinancialInstitutionMember |
Unsecured, committed line of credit, interest rate | One-month LIBOR plus 2.00% |
Unsecured, committed line of credit, base rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_ShortTermDebtTypeAxis = fcbc_FinancialInstitutionMember |
Unsecured, committed line of credit, maturity date | Apr. 30, 2015 |
Wholesale Repurchase Agreements |  |
Debt Instrument [Line Items] |  |
Weighted average contractual rate | 3.71%fcbc_WeightedAverageContractualRate / us-gaap_FairValueByLiabilityClassAxis = fcbc_WholesaleRepurchaseAgreementMember | 3.71%fcbc_WeightedAverageContractualRate / us-gaap_FairValueByLiabilityClassAxis = fcbc_WholesaleRepurchaseAgreementMember
FHLB Prepaid borrowing amount |  | 8,150,000 fcbc_PrepaymentOfFederalHomeLoanBankAdvances / us-gaap_FairValueByLiabilityClassAxis = fcbc_WholesaleRepurchaseAgreementMember
FHLB Borrowings |  |
Debt Instrument [Line Items] |  |
Weighted average contractual rate | 4.07%fcbc_WeightedAverageContractualRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember | 4.12%fcbc_WeightedAverageContractualRate / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember
FHLB Prepaid borrowing amount |  | 11,470,000 fcbc_PrepaymentOfFederalHomeLoanBankAdvances / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember
FHLB borrowings | 60,000,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |
FHLB Debt repayments | 5,010,000 us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |
Gain on repayment of FHLB borrowings |  | 296,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember
Unused borrowing capacity | 409,190,000 us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount / us-gaap_FairValueByLiabilityClassAxis = us-gaap_FederalHomeLoanBankBorrowingsMember |
Federal Home Loan Bank 4.21% Due 2017 |  |
Debt Instrument [Line Items] |  |
FHLB Prepaid borrowing amount | 50,000,000 fcbc_PrepaymentOfFederalHomeLoanBankAdvances / us-gaap_FairValueByLiabilityClassAxis = fcbc_FederalHomeLoanBankFourPointTwoOnePercentDueTwentySeventeenMember |
FHLB Interest rate | 4.21%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_FairValueByLiabilityClassAxis = fcbc_FederalHomeLoanBankFourPointTwoOnePercentDueTwentySeventeenMember |
FHLB maturity date | 2017 |
Federal Home Loan Bank 4.15% Due 2017 |  |
Debt Instrument [Line Items] |  |
FHLB Prepaid borrowing amount | 10,000,000 fcbc_PrepaymentOfFederalHomeLoanBankAdvances / us-gaap_FairValueByLiabilityClassAxis = fcbc_FederalHomeLoanBankFourPointOneFivePercentDueTwentySeventeenMember |
FHLB Interest rate | 4.15%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_FairValueByLiabilityClassAxis = fcbc_FederalHomeLoanBankFourPointOneFivePercentDueTwentySeventeenMember |
FHLB maturity date | 2017 |
FHLB borrowings | $ 50,000,000 us-gaap_FederalHomeLoanBankAdvancesLongTerm / us-gaap_FairValueByLiabilityClassAxis = fcbc_FederalHomeLoanBankFourPointOneFivePercentDueTwentySeventeenMember |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 + Details
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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
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- Definition Discloses the year of maturity, when only one maturity date applies. for the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount of the collateral pledged in support of federal home loan bank advances outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 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 210.9-03.16) -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 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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