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Fair Values of Assets and Liabilities - Losses Realized on Assets Measured on Non-Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value Disclosures [Abstract] |  |  |  |
Impaired loans | $ (6,750) | $ (848) | $ (8,554) | $ (500)
Other real estate owned | (4) | 0 | (38) | 0
Total losses | $ (6,754) | $ (848) | $ (8,592) | $ (500)

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- Definition Net losses on assets measured on nonrecurring basis. + References No definition available. + Details
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- Definition Net losses on impaired loans still held at the end of the period. + References No definition available. + Details
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- Definition Net losses on other real estate owned still held at the end of the period + References No definition available. + Details
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Namespace Prefix: | fcf_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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