| **Fair Values of Assets and Liabilities (Tables)**                                | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Fair Value Disclosures [Abstract]**                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Fair Value Inputs, Assets, Quantitative Information                               | In accordance with ASU 2011-4, the following table provides information related to quantitative inputs and assumptions used in Level 3 fair value measurements. Fair Value (dollarsin thousands) ValuationTechnique Unobservable Inputs Range /(weighted average)Pooled Trust Preferred Securities$28,154 Discounted Cash Flow Probability of default 0% - 100% (17.48%)     Prepayment rates 0% - 100% (6.35%)     Discount rates 5.5% - 14.5% (a)Equities1,420 Par Value N/A N/AInterest Rate Swap— Option model Counterparty credit risk 3.74% - 6.62% (b)Impaired Loans6,120 (c) Reserve study Discount rate 10.00%     Gas per MCF $3.84 - $6.45 (d)     Oil per BBL/d $83.64 - $107.00 (d)     NGL per gallon $0.83 (d) 113 (c) Discounted Cash Flow Discount Rate 9.00%Other Real Estate Owned139 Internal Valuation N/A N/A (a)incorporates spread over risk free rate related primarily to credit quality and illiquidity of securities.(b)represents the range of the credit spread curve used in valuation.(c)the remainder of impaired loans valued using Level 3 inputs are not included in this disclosure as the values of those loans are based on bankruptcy agreement documentation.(d)unobservable inputs are defined as follows: MCF - million cubic feet; BBL/d - barrels per day; NGL - natural gas liquid.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis      | The tables below present the balances of assets and liabilities measured at fair value on a recurring basis: June 30, 2014 Level 1 Level 2 Level 3 Total (dollars in thousands)Obligations of U.S. Government Agencies:       Mortgage-Backed Securities - Residential$— $23,303 $— $23,303Obligations of U.S. Government-Sponsored Enterprises:       Mortgage-Backed Securities - Residential— 1,003,119 — 1,003,119Mortgage-Backed Securities - Commercial— 90 — 90Other Government-Sponsored Enterprises— 268,387 — 268,387Obligations of States and Political Subdivisions— 15,889 — 15,889Corporate Securities— 7,249 — 7,249Pooled Trust Preferred Collateralized Debt Obligations— — 28,154 28,154Total Debt Securities— 1,318,037 28,154 1,346,191Equities— — 1,420 1,420Total Securities Available for Sale— 1,318,037 29,574 1,347,611Other Investments— 44,077 — 44,077Loans held for sale— — — —Other Assets(a)— 11,104 — 11,104Total Assets$— $1,373,218 $29,574 $1,402,792Other Liabilities(a)$— $10,851 $— $10,851Total Liabilities$— $10,851 $— $10,851(a)Non-hedging interest rate derivatives December 31, 2013 Level 1 Level 2 Level 3 Total (dollars in thousands)Obligations of U.S. Government Agencies:       Mortgage-Backed Securities - Residential$— $25,204 $— $25,204Obligations of U.S. Government-Sponsored Enterprises:       Mortgage-Backed Securities - Residential— 994,887 — 994,887Mortgage-Backed Securities - Commercial— 105 — 105Other Government-Sponsored Enterprises— 266,125 — 266,125Obligations of States and Political Subdivisions— 80 — 80Corporate Securities— 7,021 — 7,021Pooled Trust Preferred Collateralized Debt Obligations— — 23,523 23,523Total Debt Securities— 1,293,422 23,523 1,316,945Equities— — 1,420 1,420Total Securities Available for Sale— 1,293,422 24,943 1,318,365Other Investments— 35,444 — 35,444Loans Held for Sale— — — —Other Assets(a)— 14,358 — 14,358Total Assets$— $1,343,224 $24,943 $1,368,167Other Liabilities(a)$— $14,318 $— $14,318Total Liabilities$— $14,318 $— $14,318(a)Non-hedging interest rate derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  2014 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Heldfor Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$27,876 $1,420 $— $— $29,296Total gains or losses         Included in earnings— — 77 — 77Included in other comprehensive income1,053 — — — 1,053Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (2,396) — (2,396)Settlements(775) — — — (775)Transfers from Level 3— — — — —Transfers into Level 3— — 2,319 — 2,319Balance, end of period$28,154 $1,420 $— $— $29,574 2013 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Held for Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$24,512 $1,420 $— $— 25,932Total gains or losses         Included in earnings— — 257 — 257Included in other comprehensive income3,292 — — — 3,292Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (3,779) — (3,779)Settlements(1,935) — — — (1,935)Transfers from Level 3— — 3,522 — 3,522Balance, end of period$25,869 $1,420 $— $— $27,289For the six months endedJune 30, changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2014 Pooled TrustPreferredCollateralizedDebtObligations Equities LoansHeld forSale OtherAssets Total (dollars in thousands)Balance, beginning of period$23,523 $1,420 $— $— $24,943Total gains or losses         Included in earnings— — 77 — 77Included in other comprehensive income5,796 — — — 5,796Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (3,112) — (3,112)Settlements(1,165) — — — (1,165)Transfers into Level 3— — 3,035 — 3,035Balance, end of period$28,154 $1,420 $— $— $29,574  2013 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Held for Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$23,373 $1,420 $— $— $24,793Total gains or losses         Included in earnings— — 383 — 383Included in other comprehensive income5,683 — — — 5,683Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (20,518) — (20,518)Settlements(3,187) — — — (3,187)Transfers into Level 3— — 20,135 — 20,135Balance, end of period$25,869 $1,420 $— $— $27,289 |
| Schedule of Assets Measured on Non-Recurring Basis                                | The tables below present the balances of assets measured at fair value on a non-recurring basis at: June 30, 2014 Level 1 Level 2 Level 3 Total (dollars in thousands)Impaired loans$— $27,342 $12,873 $40,215Other real estate owned— 8,221 139 8,360Total Assets$— $35,563 $13,012 $48,575 December 31, 2013 Level 1 Level 2 Level 3 Total (dollars in thousands)Impaired loans$— $36,903 $13,656 $50,559Other real estate owned— 12,752 172 12,924Total Assets$— $49,655 $13,828 $63,483                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Losses Realized on Assets Measured on Non-Recurring Basis                         | The following losses were realized on the assets measured on a nonrecurring basis:  For the Three Months Ended June 30, For the Six Months Ended June 30, 2014 2013 2014 2013 (dollars in thousands)Impaired loans$(3,020) $(10,806) $(2,739) $(11,086)Other real estate owned(728) (241) (1,078) (362)Total losses$(3,748) $(11,047) $(3,817) $(11,448)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Carrying Amounts and Fair Values of Financial Instruments                         | The following table presents carrying amounts and fair values of First Commonwealth’s financial instruments: June 30, 2014   Fair Value Measurements Using: CarryingAmount Total Level 1 Level 2 Level 3 (dollars in thousands)Financial assets         Cash and due from banks$92,860 $92,860 $92,860 $— $—Interest-bearing deposits5,151 5,151 5,151 — —Securities available for sale1,347,611 1,347,611 — 1,318,037 29,574Other investments44,077 44,077 — 44,077 —Loans4,334,214 4,350,182 — 27,342 4,322,840Financial liabilities         Deposits4,460,421 4,465,990 — 4,465,990 —Short-term borrowings845,873 845,862 — 845,862 —Long-term debt136,672 137,861 — 137,861 —Subordinated debt72,167 61,755 — — 61,755 December 31, 2013   Fair Value Measurements Using: CarryingAmount Total Level 1 Level 2 Level 3 (dollars in thousands)Financial assets         Cash and due from banks$74,427 $74,427 $74,427 $— $—Interest-bearing deposits3,012 3,012 3,012 — —Securities available for sale1,318,365 1,318,365 — 1,293,422 24,943Other investments35,444 35,444 — 35,444 —Loans4,283,833 4,321,847 — 36,903 4,284,944Financial liabilities         Deposits4,603,863 4,531,685 — 4,531,685 —Short-term borrowings626,615 626,603 — 626,603 —Long-term debt144,385 145,477 — 145,477 —Subordinated debt72,167 51,706 — — 51,706                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |

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Losses realized on assets measured on non-recurring basis.
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Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).
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| - Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
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| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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| - Definition
Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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