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Condensed Financial Information of First Commonwealth Financial Corporation (parent company only) - Statements of Cash Flow (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Activities |  |  |
Net Income | $ 44,453us-gaap_NetIncomeLoss | $ 41,482us-gaap_NetIncomeLoss | $ 41,954us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 13,721us-gaap_DepreciationAmortizationAndAccretionNet | 11,090us-gaap_DepreciationAmortizationAndAccretionNet | 7,912us-gaap_DepreciationAmortizationAndAccretionNet
Other net | 8,253us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (2,426)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (4,079)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities | 82,137us-gaap_NetCashProvidedByUsedInOperatingActivities | 85,734us-gaap_NetCashProvidedByUsedInOperatingActivities | 78,724us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing Activities |  |  |
Purchases of premises and equipment | (10,980)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (9,635)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (10,182)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of other assets | 12,882us-gaap_ProceedsFromSaleOfOtherProductiveAssets | 12,713us-gaap_ProceedsFromSaleOfOtherProductiveAssets | 17,660us-gaap_ProceedsFromSaleOfOtherProductiveAssets
Net cash used in investing activities | (164,055)us-gaap_NetCashProvidedByUsedInInvestingActivities | (307,280)us-gaap_NetCashProvidedByUsedInInvestingActivities | (171,382)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing Activities |  |  |
Repayments of subordinated debentures | 0us-gaap_EarlyRepaymentOfSubordinatedDebt | (34,702)us-gaap_EarlyRepaymentOfSubordinatedDebt | 0us-gaap_EarlyRepaymentOfSubordinatedDebt
Discount on dividend reinvestment plan purchases | (65)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases | (112)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases | (92)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases
Dividends paid | (26,174)us-gaap_PaymentsOfDividends | (22,344)us-gaap_PaymentsOfDividends | (18,759)us-gaap_PaymentsOfDividends
Proceeds from reissuance of treasury stock | 192us-gaap_ProceedsFromSaleOfTreasuryStock | 176us-gaap_ProceedsFromSaleOfTreasuryStock | 1,028us-gaap_ProceedsFromSaleOfTreasuryStock
Purchase of treasury stock | (30,956)us-gaap_PaymentsForRepurchaseOfCommonStock | (33,439)us-gaap_PaymentsForRepurchaseOfCommonStock | (36,242)us-gaap_PaymentsForRepurchaseOfCommonStock
Stock option tax benefit | 0fcf_StockOptionTaxBenefit | 0fcf_StockOptionTaxBenefit | 1fcf_StockOptionTaxBenefit
Net cash provided by financing activities | 79,017us-gaap_NetCashProvidedByUsedInFinancingActivities | 196,003us-gaap_NetCashProvidedByUsedInFinancingActivities | 117,162us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents | (2,901)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (25,543)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 24,504us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at January 1 | 77,439us-gaap_CashAndCashEquivalentsAtCarryingValue | 102,982us-gaap_CashAndCashEquivalentsAtCarryingValue | 78,478us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at December 31 | 74,538us-gaap_CashAndCashEquivalentsAtCarryingValue | 77,439us-gaap_CashAndCashEquivalentsAtCarryingValue | 102,982us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent [Member] |  |  |
Operating Activities |  |  |
Net Income | 44,453us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentMember | 41,482us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentMember | 41,954us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentMember
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 2,150us-gaap_DepreciationAmortizationAndAccretionNet / dei_LegalEntityAxis = us-gaap_ParentMember | 3,030us-gaap_DepreciationAmortizationAndAccretionNet / dei_LegalEntityAxis = us-gaap_ParentMember | 3,719us-gaap_DepreciationAmortizationAndAccretionNet / dei_LegalEntityAxis = us-gaap_ParentMember
Net gain (loss) on sales of assets | 0us-gaap_GainsLossesOnSalesOfAssets / dei_LegalEntityAxis = us-gaap_ParentMember | 17us-gaap_GainsLossesOnSalesOfAssets / dei_LegalEntityAxis = us-gaap_ParentMember | (107)us-gaap_GainsLossesOnSalesOfAssets / dei_LegalEntityAxis = us-gaap_ParentMember
(Increase) decrease in prepaid income taxes | (487)us-gaap_IncreaseDecreaseInPrepaidTaxes / dei_LegalEntityAxis = us-gaap_ParentMember | 3,044us-gaap_IncreaseDecreaseInPrepaidTaxes / dei_LegalEntityAxis = us-gaap_ParentMember | (3,044)us-gaap_IncreaseDecreaseInPrepaidTaxes / dei_LegalEntityAxis = us-gaap_ParentMember
Undistributed equity in subsidiaries | (127)fcf_RetainedEarningsUndistributedEarningFromEquityMethodInvestees / dei_LegalEntityAxis = us-gaap_ParentMember | 17,748fcf_RetainedEarningsUndistributedEarningFromEquityMethodInvestees / dei_LegalEntityAxis = us-gaap_ParentMember | 14,562fcf_RetainedEarningsUndistributedEarningFromEquityMethodInvestees / dei_LegalEntityAxis = us-gaap_ParentMember
Other net | 13,077us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentMember | 12,964us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentMember | 8,789us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = us-gaap_ParentMember
Net cash provided by operating activities | 59,066us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 78,285us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 65,873us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Investing Activities |  |  |
Net change in loans | 3us-gaap_PaymentsForProceedsFromLoansReceivable / dei_LegalEntityAxis = us-gaap_ParentMember | 4us-gaap_PaymentsForProceedsFromLoansReceivable / dei_LegalEntityAxis = us-gaap_ParentMember | 4us-gaap_PaymentsForProceedsFromLoansReceivable / dei_LegalEntityAxis = us-gaap_ParentMember
Purchases of premises and equipment | (47)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember | (123)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember | (3,005)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from sale of other assets | 13us-gaap_ProceedsFromSaleOfOtherProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentMember | 1,132us-gaap_ProceedsFromSaleOfOtherProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentMember | 4,309us-gaap_ProceedsFromSaleOfOtherProductiveAssets / dei_LegalEntityAxis = us-gaap_ParentMember
Net cash used in investing activities | (31)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 1,013us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | 1,308us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Financing Activities |  |  |
Repayments of subordinated debentures | 0us-gaap_EarlyRepaymentOfSubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentMember | (34,702)us-gaap_EarlyRepaymentOfSubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentMember | 0us-gaap_EarlyRepaymentOfSubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentMember
Discount on dividend reinvestment plan purchases | (65)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases / dei_LegalEntityAxis = us-gaap_ParentMember | (112)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases / dei_LegalEntityAxis = us-gaap_ParentMember | (92)fcf_PaymentsForDiscountOnDividendReinvestmentPlanPurchases / dei_LegalEntityAxis = us-gaap_ParentMember
Dividends paid | (26,174)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember | (22,344)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember | (18,759)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentMember
Proceeds from reissuance of treasury stock | 192us-gaap_ProceedsFromSaleOfTreasuryStock / dei_LegalEntityAxis = us-gaap_ParentMember | 176us-gaap_ProceedsFromSaleOfTreasuryStock / dei_LegalEntityAxis = us-gaap_ParentMember | 1,028us-gaap_ProceedsFromSaleOfTreasuryStock / dei_LegalEntityAxis = us-gaap_ParentMember
Purchase of treasury stock | (30,956)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentMember | (33,439)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentMember | (36,242)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentMember
Stock option tax benefit | 0fcf_StockOptionTaxBenefit / dei_LegalEntityAxis = us-gaap_ParentMember | 0fcf_StockOptionTaxBenefit / dei_LegalEntityAxis = us-gaap_ParentMember | 1fcf_StockOptionTaxBenefit / dei_LegalEntityAxis = us-gaap_ParentMember
Net cash provided by financing activities | (57,003)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | (90,421)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember | (54,064)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentMember
Net (decrease) increase in cash and cash equivalents | 2,032us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember | (11,123)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember | 13,117us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentMember
Cash and cash equivalents at January 1 | 8,370us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 19,493us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | 6,376us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember
Cash and cash equivalents at December 31 | $ 10,402us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | $ 8,370us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember | $ 19,493us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentMember

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- Definition The cash outflow associated with the 5% discount on the shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity. + References No definition available. + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of other tangible or intangible assets used to produce goods or deliver services not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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