| **Fair Values of Assets and Liabilities (Tables)**                                | 9 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$25,457 Discounted Cash Flow Probability of default 0% - 100% (19.61%)     Prepayment rates 0% - 99.75% (8.2%)     Discount rates 5.75% - 15.5% (a)Equities1,420 Par Value N/A N/AInterest Rate Swap— Option model Counterparty credit risk 7.98% - 9.11% (b)Impaired Loans7,727 (c) Reserve study Discount rate 10.00%     Gas per MCF $3.56 - $7.60 (d)     Oil per BBL/d $79.97 - $106.00 (d)     NGL per gallon $1.54 (d)Other Real Estate Owned242 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: September 30, 2013 Level 1 Level 2 Level 3 Total (dollars in thousands)Obligations of U.S. Government Agencies:       Mortgage-Backed Securities - Residential$— $26,451 $— $26,451Obligations of U.S. Government-Sponsored Enterprises:       Mortgage-Backed Securities - Residential— 964,233 — 964,233Mortgage-Backed Securities - Commercial— 116 — 116Other Government-Sponsored Enterprises— 266,303 — 266,303Obligations of States and Political Subdivisions— 82 — 82Corporate Securities— 7,001 — 7,001Pooled Trust Preferred Collateralized Debt Obligations— — 25,457 25,457Total Debt Securities— 1,264,186 25,457 1,289,643Equities— — 1,420 1,420Total Securities Available for Sale— 1,264,186 26,877 1,291,063Other Investments— 33,704 — 33,704Loans held for sale— — — —Other Assets(a)— 14,249 — 14,249Total Assets$— $1,312,139 $26,877 $1,339,016Other Liabilities(a)$— $14,360 $— $14,360Total Liabilities$— $14,360 $— $14,360(a)Non-hedging interest rate derivatives December 31, 2012 Level 1 Level 2 Level 3 Total (dollars in thousands)Obligations of U.S. Government Agencies:       Mortgage-Backed Securities - Residential$— $31,664 $— $31,664Obligations of U.S. Government-Sponsored Enterprises:       Mortgage-Backed Securities - Residential— 864,401 — 864,401Mortgage-Backed Securities - Commercial— 149 — 149Other Government-Sponsored Enterprises— 242,664 — 242,664Obligations of States and Political Subdivisions— 86 — 86Corporate Securities— 6,991 — 6,991Pooled Trust Preferred Collateralized Debt Obligations— — 23,373 23,373Total Debt Securities— 1,145,955 23,373 1,169,328Equities555 — 1,420 1,975Total Securities Available for Sale555 1,145,955 24,793 1,171,303Other Investments— 28,228 — 28,228Loans Held for Sale— — — —Other Assets(a)— 16,480 — 16,480Total Assets$555 $1,190,663 $24,793 $1,216,011Other Liabilities(a)$— $18,726 $— $18,726Total Liabilities$— $18,726 $— $18,726(a)Non-hedging interest rate derivatives                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | For the three-months endedSeptember 30 changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2013 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Heldfor Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$25,869 $1,420 $— $— $27,289Total gains or losses         Included in earnings— — 242 — 242Included in other comprehensive income1,716 — — — 1,716Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (242) — (242)Settlements(2,128) — — — (2,128)Transfers into Level 3— — — — —Balance, end of period$25,457 $1,420 $— $— $26,877 2012 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Held for Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$21,792 $1,420 $— $— 23,212Total gains or losses         Included in earnings— — — — —Included in other comprehensive income2,030 — — — 2,030Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — — — —Settlements(771) — — — (771)Transfers from Level 3— — — — —Balance, end of period$23,051 $1,420 $— $— $24,471For the nine-months endedSeptember 30 changes in Level 3 assets and liabilities measured at fair value on a recurring basis are summarized as follows: 2013 Pooled TrustPreferredCollateralizedDebtObligations Equities LoansHeld forSale OtherAssets Total (dollars in thousands)Balance, beginning of period$23,373 $1,420 $— $— $24,793Total gains or losses         Included in earnings— — 625 — 625Included in other comprehensive income7,399 — — — 7,399Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (20,760) — (20,760)Settlements(5,315) — — — (5,315)Transfers into Level 3— — 20,135 — 20,135Balance, end of period$25,457 $1,420 $— $— $26,877  2012 Pooled TrustPreferredCollateralizedDebtObligations Equities Loans Held for Sale OtherAssets Total (dollars in thousands)Balance, beginning of period$22,980 $1,420 $13,412 $— $37,812Total gains or losses         Included in earnings— — 2,870 (461) 2,409Included in other comprehensive income3,610 — — — 3,610Purchases, issuances, sales, and settlements         Purchases— — — — —Issuances— — — — —Sales— — (15,981) — (15,981)Settlements(3,539) — (301) — (3,840)Transfers into Level 3— — — 461 461Balance, end of period$23,051 $1,420 $— $— $24,471 |
| Schedule of Assets Measured on Non-Recurring Basis                                | The tables below present the balances of assets measured at fair value on a non-recurring basis at: September 30, 2013 Level 1 Level 2 Level 3 Total (dollars in thousands)Impaired loans$— $48,673 $14,307 $62,980Other real estate owned— 10,633 242 10,875Total Assets$— $59,306 $14,549 $73,855 December 31, 2012 Level 1 Level 2 Level 3 Total (dollars in thousands)Impaired loans$— $82,949 $6,827 $89,776Other real estate owned— 11,981 247 12,228Total Assets$— $94,930 $7,074 $102,004                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 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 September 30 For the Nine-Months Ended September 30 2013 2012 2013 2012 (dollars in thousands)Impaired loans$(1,468) $(3,890) $(13,063) $(7,352)Other real estate owned(90) (366) (188) (523)Total losses$(1,558) $(4,256) $(13,251) $(7,875)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Carrying Amounts and Fair Values of Financial Instruments                         | The following table presents carrying amounts and fair values of First Commonwealth’s financial instruments: September 30, 2013   Fair Value Measurements Using: CarryingAmount Total Level 1 Level 2 Level 3 (dollars in thousands)Financial assets         Cash and due from banks$88,179 $88,179 $88,179 $— $—Interest-bearing deposits5,077 5,077 5,077 — —Securities available for sale1,291,063 1,291,063 — 1,264,186 26,877Other investments33,704 33,704 — 33,704 —Loans4,240,004 4,290,985 — 48,673 4,242,312Financial liabilities         Deposits4,617,801 4,548,409 — 4,548,409 —Short-term borrowings551,628 551,619 — 551,619 —Long-term debt144,501 145,654 — 145,654 —Subordinated debt72,167 48,033 — — 48,033 December 31, 2012   Fair Value Measurements Using: CarryingAmount Total Level 1 Level 2 Level 3 (dollars in thousands)Financial assets         Cash and due from banks$98,724 $98,724 $98,724 $— $—Interest-bearing deposits4,258 4,258 4,258 — —Securities available for sale1,171,303 1,171,303 555 1,145,955 24,793Other investments28,228 28,228 — 28,228 —Loans4,204,704 4,245,114 — 82,949 4,162,165Financial liabilities         Deposits4,557,881 4,493,764 — 4,493,764 —Short-term borrowings356,227 356,221 — 356,221 —Long-term debt174,471 176,178 — 176,178 —Subordinated debt105,750 76,735 — — 76,735                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |

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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 (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
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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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