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Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 250,550 | $ 217,614 | $ 204,071
Interest expense | (21,770) | (18,579) | (15,595)
Other income | 7,677 | 6,372 | 7,041
Applicable income tax (provision) benefits | (48,561) | (25,639) | (20,836)
Net Income | 55,165 | 59,590 | 50,143
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 1 | 1 | 1
Dividends from subsidiaries | 52,586 | 55,510 | 49,917
Interest expense | (3,000) | (2,635) | (2,357)
Other income | 17 | 83 | 232
Operating expense | (4,767) | (4,700) | (4,989)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 44,837 | 48,259 | 42,804
Applicable income tax (provision) benefits | 2,557 | 2,515 | 2,528
Income (loss) before equity in undistributed earnings of subsidiaries | 47,394 | 50,774 | 45,332
Equity in undistributed (loss) earnings of subsidiaries | 7,771 | 8,816 | 4,811
Net Income | $ 55,165 | $ 59,590 | $ 50,143

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