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Premises and Equipment - Schedule of Future Minimum Rentals (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Premises [Member] |
Operating Leased Assets [Line Items] |
2014 | $ 3,257fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueCurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
2015 | 2,969fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
2016 | 2,758fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
2017 | 2,582fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFourYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
2018 | 2,330fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFiveYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
Therafter | 12,276fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueThereafter / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
Total | 26,172fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = fcf_PremisesMember
Equipment [Member] |
Operating Leased Assets [Line Items] |
2014 | 56fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueCurrent / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
2015 | 0fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInTwoYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
2016 | 0fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInThreeYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
2017 | 0fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFourYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
2018 | 0fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFiveYears / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
Therafter | 0fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueThereafter / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
Total | $ 56fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDue / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember

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- Definition Future Minimum Rent Expense Corporate Office Leases Due + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due Current + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueCurrent
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due In Five Years + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFiveYears
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due In Four Years + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInFourYears
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due In Three Years + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInThreeYears
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due In Two Years + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueInTwoYears
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future Minimum Rent Expense Corporate Office Leases Due Thereafter + References No definition available. + Details
Name: | fcf_FutureMinimumRentExpenseCorporateOfficeLeasesDueThereafter
Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=fcf_PremisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |