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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, 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