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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets |  |  |  |
Loans | $ 5,359,078 | $ 4,829,162 |  |
Premises and equipment, net | 81,339 | 67,534 |  |
Other assets | 77,465 | 84,648 |  |
Total assets | 7,308,539 | 6,684,018 |  |
Liabilities and Shareholders' Equity |  |  |  |
Subordinated debentures payable | 72,167 | 72,167 |  |
Shareholders' equity | 888,127 | 749,929 | $ 719,546 | $ 716,145
Total liabilities and shareholders’ equity | 7,308,539 | 6,684,018 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash | 16,432 | 30,387 |  |
Loans | 17 | 19 |  |
Investment in subsidiaries | 927,765 | 770,214 |  |
Investment in unconsolidated subsidiary trusts | 2,186 | 2,185 |  |
Investment in Jointly-Owned Company | 9,191 | 9,042 |  |
Premises and equipment, net | 3,715 | 3,793 |  |
Recievable from subsidiaries | 0 | 33 |  |
Dividends receivable from subsidiaries | 0 | 4,662 |  |
Other assets | 4,996 | 2,453 |  |
Total assets | 964,302 | 822,788 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accrued expenses and other liabilities | 4,008 | 692 |  |
Subordinated debentures payable | 72,167 | 72,167 |  |
Shareholders' equity | 888,127 | 749,929 |  |
Total liabilities and shareholders’ equity | $ 964,302 | $ 822,788 |  |

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