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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Loans | $ 5,726,375 | $ 5,359,078 |  |
Premises and equipment, net | 80,474 | 81,339 |  |
Other assets | 68,409 | 77,465 |  |
Total assets | 7,828,255 | 7,308,539 |  |
Liabilities and Shareholders' Equity |  |  |  |
Subordinated Debentures outstanding, Amount | 170,288 | 72,167 |  |
Shareholders' equity | 975,389 | 888,127 | $ 749,929 | $ 719,546
Total liabilities and shareholders’ equity | 7,828,255 | 7,308,539 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash | 21,466 | 16,432 |  |
Loans | 14 | 17 |  |
Investment in subsidiaries | 1,014,685 | 927,765 |  |
Investment in unconsolidated subsidiary trusts | 2,192 | 2,186 |  |
Investment in Jointly-Owned Company | 280 | 9,191 |  |
Premises and equipment, net | 3,519 | 3,715 |  |
Dividends receivable from subsidiaries | 5,444 | 0 |  |
Other assets | 5,402 | 4,996 |  |
Total assets | 1,053,002 | 964,302 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accrued expenses and other liabilities | 5,446 | 4,008 |  |
Subordinated Debentures outstanding, Amount | 72,167 | 72,167 |  |
Shareholders' equity | 975,389 | 888,127 |  |
Total liabilities and shareholders’ equity | $ 1,053,002 | $ 964,302 |  |

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