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Regulatory Restrictions and Capital Adequacy - Schedule of Capital Amount and Ratio Considered to be Capitalized (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Well Capitalized Regulatory Guidelines [Member] | First Commonwealth Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines	$ 519,021us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	$ 495,344us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Tier I Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines, Capital Amount	311,413us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	297,206us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Tier I Capital to Average Assets, Well Capitalized Regulatory Guidelines, Capital Amount	306,595us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	297,491us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Total Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Tier I Capital to Risk Weighted Assets, Well Capitalized Regulatory Guidelines Ratio	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Tier I Capital to Average Assets, Well Capitalized Regulatory Guidelines Ratio	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_WellCapitalizedRatioMember
Regulatory Minimum [Member] | First Commonwealth Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount	415,217us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	396,275us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount	207,608us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	198,138us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount	245,276us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	237,993us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Average Assets, Regulatory Minimum Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Regulatory Minimum [Member] | First Commonwealth Financial Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount	414,460us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	396,009us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Capital Amount	207,230us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	198,004us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Average Assets, Regulatory Minimum Capital Amount	246,738us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	239,430us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Total Capital to Risk Weighted Assets, Regulatory Minimum Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Risk Weighted Assets, Regulatory Minimum Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Tier I Capital to Average Assets, Regulatory Minimum Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_RegulatoryMinimumForWellCapitalizedUnderFDICIMember
Actual [Member] | First Commonwealth Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets	647,500us-gaap_Capital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	637,415us-gaap_Capital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Risk Weighted Assets	592,369us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	580,031us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Average Assets	592,369us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	580,031us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Total Capital to Risk Weighted Assets, Ratio	12.48%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	12.87%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Risk Weighted Assets, Ratio	11.41%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	11.71%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Average Assets, Ratio	9.66%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	9.75%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthWealthBankMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Actual [Member] | First Commonwealth Financial Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets	662,733us-gaap_Capital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	656,235us-gaap_Capital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Risk Weighted Assets	607,602us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	598,851us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Average Assets	$ 607,602us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	$ 598,851us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Total Capital to Risk Weighted Assets, Ratio	12.79%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	13.26%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Risk Weighted Assets, Ratio	11.73%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	12.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember
Tier I Capital to Average Assets, Ratio	9.85%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember	10.00%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcf_FirstCommonwealthFinancialCorporationMember / us-gaap_RegulatoryAssetAxis = fcf_ActualMember

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- Definition

The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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Tier 1 Risk Based Capital as defined in the regulations.

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