| **Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Financial Condition (Detail) (USD $)In Thousands, unless otherwise specified** | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Assets**                                                                                                                                                                                         |          |          |          |          |
| Loans                                                                                                                                                                                              | $ 4,229,608   | $ 4,137,517   |          |          |
| Premises and equipment, net                                                                                                                                                                        | 67,940        | 68,970        |          |          |
| Other assets                                                                                                                                                                                       | 138,698       | 141,872       |          |          |
| Total assets                                                                                                                                                                                       | 6,214,861     | 5,995,390     |          |          |
| **Liabilities and Shareholders' Equity**                                                                                                                                                           |          |          |          |          |
| Subordinated debentures payable                                                                                                                                                                    | 72,167        | 105,750       |          |          |
| Shareholders' equity                                                                                                                                                                               | 711,697       | 746,007       | 758,543       | 749,777       |
| Total liabilities and shareholders’ equity                                                                                                                                                  | 6,214,861     | 5,995,390     |          |          |
| Parent [Member]                                                                                                                                                                                    |          |          |          |          |
| **Assets**                                                                                                                                                                                         |          |          |          |          |
| Cash                                                                                                                                                                                               | 8,370         | 19,493        |          |          |
| Loans                                                                                                                                                                                              | 27            | 30            |          |          |
| Investment in subsidiaries                                                                                                                                                                         | 696,438       | 736,165       |          |          |
| Investment in unconsolidated subsidiary trusts                                                                                                                                                     | 2,182         | 3,291         |          |          |
| Investment in Jointly-Owned Company                                                                                                                                                                | 8,559         | 8,347         |          |          |
| Premises and equipment, net                                                                                                                                                                        | 6,376         | 9,347         |          |          |
| Recievable from subsidiaries                                                                                                                                                                       | 267           | 1,583         |          |          |
| Dividends receivable from subsidiaries                                                                                                                                                             | 1,319         | 1,205         |          |          |
| Other assets                                                                                                                                                                                       | 62,633        | 76,715        |          |          |
| Total assets                                                                                                                                                                                       | 786,171       | 856,176       |          |          |
| **Liabilities and Shareholders' Equity**                                                                                                                                                           |          |          |          |          |
| Accrued expenses and other liabilities                                                                                                                                                             | 2,307         | 4,419         |          |          |
| Subordinated debentures payable                                                                                                                                                                    | 72,167        | 105,750       |          |          |
| Shareholders' equity                                                                                                                                                                               | 711,697       | 746,007       |          |          |
| Total liabilities and shareholders’ equity                                                                                                                                                  | $ 786,171     | $ 856,176     |          |          |

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Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.
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Carrying amount as of the balance sheet date of dividends declared but not received.
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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.
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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.
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Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.
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