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Premises and Equipment - Schedule of Future Minimum Rentals (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Premises [Member] |
Operating Leased Assets [Line Items] |
2016 | $ 4,871
2017 | 4,965
2018 | 4,965
2019 | 4,899
2020 | 4,928
Thereafter | 44,777
Total | 69,405
Equipment [Member] |
Operating Leased Assets [Line Items] |
2016 | 74
2017 | 28
2018 | 13
2019 | 5
2020 | 0
Thereafter | 0
Total | $ 120

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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
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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 In Five Years + 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 In Four Years + 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 In Three Years + 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 In Two Years + 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 Thereafter + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |