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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