XML 44 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Securities	Jun. 30, 2012	Jun. 30, 2013 Securities	Jun. 30, 2012	Dec. 31, 2012 Securities
Investment Securities [Line Items]
Number of securities in an unrealized loss position	174		174		57
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio	4.19%		4.19%		2.78%
Carrying value of securities pledged	$ 274,990,000		$ 274,990,000		$ 292,880,000
OTTI charges incurred	0	0	0	0
Reduced severity rate	15.00%		15.00%
Severity rate reduction period	7 years		7 years
FHLBA Stock
Investment Securities [Line Items]
Investment owned at fair value	10,000,000		10,000,000		11,300,000
FRB Richmond Stock
Investment Securities [Line Items]
Investment owned at fair value	5,580,000		5,580,000		5,580,000
Mortgage-backed securities Non-Agency Alt-A residential
Investment Securities [Line Items]
Voluntary constant prepayment rate	9.70%		9.70%
Constant default rate scenario	19.00%		19.00%
Remaining underlying mortgages default period	3 years		3 years
Severity rate	69.00%		69.00%
Equity Securities
Investment Securities [Line Items]
OTTI charges incurred	$ 0	$ 0	$ 0	$ 0

X

- Definition

Carrying value of securities pledged.

+ References

No definition available.

+ Details

Name:	fcbc_CarryingValueOfSecuritiesPledged
Namespace Prefix:	fcbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Constant default rate scenario.

+ References

No definition available.

+ Details

Name:	fcbc_ConstantDefaultRateScenario
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	fcbc_InvestmentSecuritiesLineItems
Namespace Prefix:	fcbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

Reduced severity rate.

+ References

No definition available.

+ Details

Name:	fcbc_ReducedSeverityRate
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Remaining underlying mortgages default period.

+ References

No definition available.

+ Details

Name:	fcbc_RemainingUnderlyingMortgagesDefaultPeriod
Namespace Prefix:	fcbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Severity rate.

+ References

No definition available.

+ Details

Name:	fcbc_SeverityRate
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Severity rate reduction period.

+ References

No definition available.

+ Details

Name:	fcbc_SeverityRateReductionPeriod
Namespace Prefix:	fcbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Voluntary constant prepayment rate.

+ References

No definition available.

+ Details

Name:	fcbc_VoluntaryConstantPrepaymentRate
Namespace Prefix:	fcbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column E

-Article 12



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph Column C

-Article 12



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column C

-Article 12



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-12.Column C.3,4)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

-Subparagraph (SX 210.12-12C.Column C.7)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14.Column E.2,3)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 5

-Subparagraph (SX 210.12-13.Column C.6)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010



Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph Column C

-Article 12



Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph 3, 4

-Article 12



Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph 2, 3

-Article 12



Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 13

-Paragraph 6

-Article 12



Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 7

-Article 12

+ Details

Name:	us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant