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Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 202,181us-gaap_InterestAndDividendIncomeOperating | $ 206,358us-gaap_InterestAndDividendIncomeOperating | $ 219,075us-gaap_InterestAndDividendIncomeOperating
Interest expense | (18,501)us-gaap_InterestExpense | (21,707)us-gaap_InterestExpense | (30,146)us-gaap_InterestExpense
Other income | 7,445us-gaap_NoninterestIncomeOtherOperatingIncome | 12,060us-gaap_NoninterestIncomeOtherOperatingIncome | 14,365us-gaap_NoninterestIncomeOtherOperatingIncome
Applicable income tax (provision) benefits | (17,680)us-gaap_IncomeTaxExpenseBenefit | (15,281)us-gaap_IncomeTaxExpenseBenefit | (14,658)us-gaap_IncomeTaxExpenseBenefit
Net Income | 44,453us-gaap_NetIncomeLoss | 41,482us-gaap_NetIncomeLoss | 41,954us-gaap_NetIncomeLoss
Parent [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 1us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentMember | 1us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentMember | 1us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentMember
Dividends from subsidiaries | 49,207fcf_CashDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | 65,140fcf_CashDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | 64,342fcf_CashDividendsFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember
Interest expense | (2,335)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentMember | (3,128)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentMember | (5,711)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentMember
Other income | 1,251us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentMember | 2,653us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentMember | 12,581us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentMember
Operating expense | (6,766)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentMember | (8,820)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentMember | (19,061)us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentMember
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 41,358fcf_IncomeLossBeforeIncomeTaxesAndEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | 55,846fcf_IncomeLossBeforeIncomeTaxesAndEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | 52,152fcf_IncomeLossBeforeIncomeTaxesAndEquityInUndistributedEarningsLossOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember
Applicable income tax (provision) benefits | 2,968us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentMember | 3,384us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentMember | 4,364us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentMember
Income (loss) before equity in undistributed earnings of subsidiaries | 44,326fcf_IncomeLossBeforeEquityInUndistributedEarningsLossOfSubsidiariesAndPreferredDividends / dei_LegalEntityAxis = us-gaap_ParentMember | 59,230fcf_IncomeLossBeforeEquityInUndistributedEarningsLossOfSubsidiariesAndPreferredDividends / dei_LegalEntityAxis = us-gaap_ParentMember | 56,516fcf_IncomeLossBeforeEquityInUndistributedEarningsLossOfSubsidiariesAndPreferredDividends / dei_LegalEntityAxis = us-gaap_ParentMember
Equity in undistributed (loss) earnings of subsidiaries | 127fcf_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | (17,748)fcf_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember | (14,562)fcf_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentMember
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

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