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Summary of Quarterly Earnings (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 28,181 us-gaap_InterestAndDividendIncomeOperating | $ 25,751 us-gaap_InterestAndDividendIncomeOperating | $ 26,093 us-gaap_InterestAndDividendIncomeOperating | $ 26,083 us-gaap_InterestAndDividendIncomeOperating | $ 27,364 us-gaap_InterestAndDividendIncomeOperating | $ 26,696 us-gaap_InterestAndDividendIncomeOperating | $ 27,412 us-gaap_InterestAndDividendIncomeOperating | $ 28,004 us-gaap_InterestAndDividendIncomeOperating | $ 106,108 us-gaap_InterestAndDividendIncomeOperating | $ 109,476 us-gaap_InterestAndDividendIncomeOperating | $ 109,656 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 3,471 us-gaap_InterestExpense | 3,736 us-gaap_InterestExpense | 4,025 us-gaap_InterestExpense | 4,058 us-gaap_InterestExpense | 4,272 us-gaap_InterestExpense | 4,370 us-gaap_InterestExpense | 4,550 us-gaap_InterestExpense | 4,642 us-gaap_InterestExpense | 15,290 us-gaap_InterestExpense | 17,834 us-gaap_InterestExpense | 19,600 us-gaap_InterestExpense
Net interest income | 24,710 us-gaap_InterestIncomeExpenseNet | 22,015 us-gaap_InterestIncomeExpenseNet | 22,068 us-gaap_InterestIncomeExpenseNet | 22,025 us-gaap_InterestIncomeExpenseNet | 23,092 us-gaap_InterestIncomeExpenseNet | 22,326 us-gaap_InterestIncomeExpenseNet | 22,862 us-gaap_InterestIncomeExpenseNet | 23,362 us-gaap_InterestIncomeExpenseNet | 90,818 us-gaap_InterestIncomeExpenseNet | 91,642 us-gaap_InterestIncomeExpenseNet | 90,056 us-gaap_InterestIncomeExpenseNet
Provision for (recovery of) loan losses | (488)fcbc_ProvisionRecoveriesForLoanLosses | (2,439)fcbc_ProvisionRecoveriesForLoanLosses | 1,279 fcbc_ProvisionRecoveriesForLoanLosses | 1,793 fcbc_ProvisionRecoveriesForLoanLosses | 1,528 fcbc_ProvisionRecoveriesForLoanLosses | 2,333 fcbc_ProvisionRecoveriesForLoanLosses | 3,205 fcbc_ProvisionRecoveriesForLoanLosses | 1,142 fcbc_ProvisionRecoveriesForLoanLosses |  |  |
Net interest income after provision for loan losses | 25,198 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 24,454 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 20,789 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 20,232 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 21,564 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 19,993 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 19,657 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 22,220 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 90,673 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 83,434 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 84,378 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Other income | 9,189 us-gaap_OtherOperatingIncome | 7,347 us-gaap_OtherOperatingIncome | 7,663 us-gaap_OtherOperatingIncome | 7,189 us-gaap_OtherOperatingIncome | 6,743 us-gaap_OtherOperatingIncome | 8,150 us-gaap_OtherOperatingIncome | 6,735 us-gaap_OtherOperatingIncome | 7,744 us-gaap_OtherOperatingIncome | 4,355 us-gaap_OtherOperatingIncome | 5,235 us-gaap_OtherOperatingIncome | 6,742 us-gaap_OtherOperatingIncome
Net gain (loss) on sale of securities | (1,691)us-gaap_GainLossOnSaleOfSecuritiesNet | 320 us-gaap_GainLossOnSaleOfSecuritiesNet | (59)us-gaap_GainLossOnSaleOfSecuritiesNet | 45 us-gaap_GainLossOnSaleOfSecuritiesNet | 208 us-gaap_GainLossOnSaleOfSecuritiesNet | (39)us-gaap_GainLossOnSaleOfSecuritiesNet | 113 us-gaap_GainLossOnSaleOfSecuritiesNet | 117 us-gaap_GainLossOnSaleOfSecuritiesNet | (1,385)us-gaap_GainLossOnSaleOfSecuritiesNet | 399 us-gaap_GainLossOnSaleOfSecuritiesNet | 483 us-gaap_GainLossOnSaleOfSecuritiesNet
Other expenses | 24,050 us-gaap_OtherCostAndExpenseOperating | 21,469 us-gaap_OtherCostAndExpenseOperating | 18,163 us-gaap_OtherCostAndExpenseOperating | 19,180 us-gaap_OtherCostAndExpenseOperating | 20,755 us-gaap_OtherCostAndExpenseOperating | 20,153 us-gaap_OtherCostAndExpenseOperating | 18,533 us-gaap_OtherCostAndExpenseOperating | 19,544 us-gaap_OtherCostAndExpenseOperating | 22,242 us-gaap_OtherCostAndExpenseOperating | 23,248 us-gaap_OtherCostAndExpenseOperating | 21,190 us-gaap_OtherCostAndExpenseOperating
Income before income taxes | 8,646 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,652 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,230 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 8,286 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,760 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,951 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 7,972 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 10,537 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 37,814 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 34,220 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 42,705 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax | 2,931 us-gaap_IncomeTaxExpenseBenefit | 3,609 us-gaap_IncomeTaxExpenseBenefit | 3,223 us-gaap_IncomeTaxExpenseBenefit | 2,561 us-gaap_IncomeTaxExpenseBenefit | 2,436 us-gaap_IncomeTaxExpenseBenefit | 2,539 us-gaap_IncomeTaxExpenseBenefit | 2,537 us-gaap_IncomeTaxExpenseBenefit | 3,396 us-gaap_IncomeTaxExpenseBenefit | 12,324 us-gaap_IncomeTaxExpenseBenefit | 10,908 us-gaap_IncomeTaxExpenseBenefit | 14,128 us-gaap_IncomeTaxExpenseBenefit
Net income | 5,715 us-gaap_NetIncomeLoss | 7,043 us-gaap_NetIncomeLoss | 7,007 us-gaap_NetIncomeLoss | 5,725 us-gaap_NetIncomeLoss | 5,324 us-gaap_NetIncomeLoss | 5,412 us-gaap_NetIncomeLoss | 5,435 us-gaap_NetIncomeLoss | 7,141 us-gaap_NetIncomeLoss | 25,490 us-gaap_NetIncomeLoss | 23,312 us-gaap_NetIncomeLoss | 28,577 us-gaap_NetIncomeLoss
Dividends on preferred stock | 227 us-gaap_PreferredStockDividendsIncomeStatementImpact | 228 us-gaap_PreferredStockDividendsIncomeStatementImpact | 227 us-gaap_PreferredStockDividendsIncomeStatementImpact | 228 us-gaap_PreferredStockDividendsIncomeStatementImpact | 252 us-gaap_PreferredStockDividendsIncomeStatementImpact | 261 us-gaap_PreferredStockDividendsIncomeStatementImpact | 253 us-gaap_PreferredStockDividendsIncomeStatementImpact | 258 us-gaap_PreferredStockDividendsIncomeStatementImpact | 910 us-gaap_PreferredStockDividendsIncomeStatementImpact | 1,024 us-gaap_PreferredStockDividendsIncomeStatementImpact | 1,058 us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders | $ 5,488 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,815 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,780 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,497 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,072 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,151 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 5,182 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,883 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 24,580 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 22,288 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 27,519 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per common share | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 0.30 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.26 us-gaap_EarningsPerShareBasic | $ 0.34 us-gaap_EarningsPerShareBasic | $ 1.34 us-gaap_EarningsPerShareBasic | $ 1.13 us-gaap_EarningsPerShareBasic | $ 1.44 us-gaap_EarningsPerShareBasic
Diluted earnings per common share | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.26 us-gaap_EarningsPerShareDiluted | $ 0.34 us-gaap_EarningsPerShareDiluted | $ 1.31 us-gaap_EarningsPerShareDiluted | $ 1.11 us-gaap_EarningsPerShareDiluted | $ 1.40 us-gaap_EarningsPerShareDiluted
Dividend per common share | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.13 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.12 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.50 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.48 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.43 us-gaap_CommonStockDividendsPerShareCashPaid
Weighted average basic shares outstanding | 18,403,959 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,402,764 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,395,996 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,423,123 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,136,317 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,008,861 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,997,991 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,032,694 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 18,406,363 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,792,099 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 19,127,065 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average diluted shares outstanding | 19,482,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,466,126 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,457,237 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,506,647 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,233,737 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,123,788 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,205,078 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,258,490 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 19,483,054 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,961,800 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,419,569 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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