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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Interest and dividends $ 292,257 $ 250,550 $ 217,614
Interest expense (40,035) (21,770) (18,579)
Other income 6,790 7,677 6,372
Applicable income tax (provision) benefits (25,274) (48,561) (25,639)
Net Income 107,498 55,165 59,590
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Interest and dividends 1 1 1
Dividends from subsidiaries 81,851 52,586 55,510
Interest expense (3,722) (3,000) (2,635)
Other income 14 17 83
Operating expense (4,047) (4,767) (4,700)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries 74,097 44,837 48,259
Applicable income tax (provision) benefits 1,324 2,557 2,515
Income (loss) before equity in undistributed earnings of subsidiaries 75,421 47,394 50,774
Equity in undistributed (loss) earnings of subsidiaries 32,077 7,771 8,816
Net Income $ 107,498 $ 55,165 $ 59,590