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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
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 204,071 | $ 202,181 | $ 206,358
Interest expense | (15,595) | (18,501) | (21,707)
Other income | 7,614 | 7,445 | 12,060
Applicable income tax (provision) benefits | (20,836) | (17,680) | (15,281)
Net Income | 50,143 | 44,453 | 41,482
Parent [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 1 | 1 | 1
Dividends from subsidiaries | 49,917 | 49,207 | 65,140
Interest expense | (2,357) | (2,335) | (3,128)
Other income | 232 | 1,251 | 2,653
Operating expense | (4,989) | (6,766) | (8,820)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 42,804 | 41,358 | 55,846
Applicable income tax (provision) benefits | 2,528 | 2,968 | 3,384
Income (loss) before equity in undistributed earnings of subsidiaries | 45,332 | 44,326 | 59,230
Equity in undistributed (loss) earnings of subsidiaries | 4,811 | 127 | (17,748)
Net Income | $ 50,143 | $ 44,453 | $ 41,482

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