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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Loans | $ 6,137,511 | $ 5,726,375 |  |
Premises and equipment, net | 137,268 | 80,474 |  |
Other assets | 97,328 | 68,409 |  |
Total assets | 8,308,773 | 7,828,255 |  |
Liabilities and Shareholders' Equity |  |  |  |
Subordinated Debentures outstanding, Amount | 170,450 | 170,288 |  |
Shareholders' equity | 1,055,665 | 975,389 | $ 888,127 | $ 749,929
Total liabilities and shareholders’ equity | 8,308,773 | 7,828,255 |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash | 22,889 | 21,466 |  |
Loans | 13 | 14 |  |
Investment in subsidiaries | 1,086,844 | 1,014,685 |  |
Investment in unconsolidated subsidiary trusts | 2,190 | 2,192 |  |
Investment in Jointly-Owned Company | 306 | 280 |  |
Premises and equipment, net | 3,801 | 3,519 |  |
Receivables From Subsidiaries | 4,750 | 0 |  |
Dividends receivable from subsidiaries | 5,097 | 5,444 |  |
Other assets | 6,924 | 5,402 |  |
Total assets | 1,132,814 | 1,053,002 |  |
Liabilities and Shareholders' Equity |  |  |  |
Accrued expenses and other liabilities | 4,983 | 5,446 |  |
Subordinated Debentures outstanding, Amount | 72,167 | 72,167 |  |
Shareholders' equity | 1,055,664 | 975,389 |  |
Total liabilities and shareholders’ equity | $ 1,132,814 | $ 1,053,002 |  |

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