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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 217,614 | $ 204,071 | $ 202,181
Interest expense | (18,579) | (15,595) | (18,501)
Other income | 6,372 | 7,041 | 7,279
Applicable income tax (provision) benefits | (25,639) | (20,836) | (17,680)
Net Income | 59,590 | 50,143 | 44,453
Parent [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 1 | 1 | 1
Dividends from subsidiaries | 55,510 | 49,917 | 49,207
Interest expense | (2,635) | (2,357) | (2,335)
Other income | 83 | 232 | 1,251
Operating expense | (4,700) | (4,989) | (6,766)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 48,259 | 42,804 | 41,358
Applicable income tax (provision) benefits | 2,515 | 2,528 | 2,968
Income (loss) before equity in undistributed earnings of subsidiaries | 50,774 | 45,332 | 44,326
Equity in undistributed (loss) earnings of subsidiaries | 8,816 | 4,811 | 127
Net Income | $ 59,590 | $ 50,143 | $ 44,453

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