XML 132 R66.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 Securities | Dec. 31, 2012 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Held-to-maturity securities in continuous unrealized loss position | $ 0 us-gaap_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss | $ 0 us-gaap_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss |
Number of securities in an unrealized loss position | 219 fcbc_NumberOfSecuritiesInUnrealizedLossPosition |  | 97 fcbc_NumberOfSecuritiesInUnrealizedLossPosition
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 5.06%fcbc_PercentageOfCombinedDepreciationOfCombinedReportedValueOfAggregateSecuritiesPortfolio |  | 3.21%fcbc_PercentageOfCombinedDepreciationOfCombinedReportedValueOfAggregateSecuritiesPortfolio
Carrying value of available-for-sale securities pledged | 284,770,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |  | 268,780,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Continuous Loss Position More Than Twelve Months |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities in an unrealized loss position |  |  | 82 fcbc_NumberOfSecuritiesInUnrealizedLossPosition / us-gaap_RangeAxis = fcbc_ContinuousLossPositionMoreThanTwelveMonthsMember
Debt Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred | 0 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |  | 0 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Non Agency Mortgage Backed Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred | 320,000 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_NonAgencyMortgageBackedSecuritiesMember |  | 705,000 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = fcbc_NonAgencyMortgageBackedSecuritiesMember
Equity Securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
OTTI charges incurred | $ 0 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  | $ 32,000 fcbc_OtherThanTemporaryImpairmentChargesIncurred / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

X
- Definition Number of securities in an unrealized loss position. + References No definition available. + Details
Name: | fcbc_NumberOfSecuritiesInUnrealizedLossPosition
Namespace Prefix: | fcbc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other than temporary impairment charges incurred. + References No definition available. + Details
Name: | fcbc_OtherThanTemporaryImpairmentChargesIncurred
Namespace Prefix: | fcbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio. + References No definition available. + Details
Name: | fcbc_PercentageOfCombinedDepreciationOfCombinedReportedValueOfAggregateSecuritiesPortfolio
Namespace Prefix: | fcbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 + Details
Name: | us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized loss on investments in held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldtomaturitySecuritiesContinuousUnrealizedLossPositionAggregateLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=fcbc_NonAgencyMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=fcbc_ContinuousLossPositionMoreThanTwelveMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |