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Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Financial Condition (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Assets |  |  |  |
Loans | $ 4,632,938 | $ 4,405,257 |  |
Premises and equipment, net | 63,454 | 64,989 |  |
Other assets | 103,717 | 110,777 |  |
Total assets | 6,566,890 | 6,360,285 |  |
Liabilities and Shareholders' Equity |  |  |  |
Subordinated debentures payable | 72,167 | 72,167 |  |
Shareholders' equity | 719,546 | 716,145 | $ 711,697 | $ 746,007
Total liabilities and shareholders’ equity | 6,566,890 | 6,360,285 |  |
Parent [Member] |  |  |  |
Assets |  |  |  |
Cash | 10,003 | 10,402 |  |
Loans | 22 | 24 |  |
Investment in subsidiaries | 719,073 | 712,610 |  |
Investment in unconsolidated subsidiary trusts | 2,182 | 2,182 |  |
Investment in Jointly-Owned Company | 8,978 | 8,749 |  |
Premises and equipment, net | 3,780 | 4,287 |  |
Recievable from subsidiaries | 441 | 0 |  |
Dividends receivable from subsidiaries | 714 | 0 |  |
Other assets | 47,631 | 50,988 |  |
Total assets | 792,824 | 789,242 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accrued expenses and other liabilities | 1,111 | 930 |  |
Subordinated debentures payable | 72,167 | 72,167 |  |
Shareholders' equity | 719,546 | 716,145 |  |
Total liabilities and shareholders’ equity | $ 792,824 | $ 789,242 |  |

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