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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 325,264 | $ 292,257 | $ 250,550
Interest expense | (55,402) | (40,035) | (21,770)
Other income | 7,268 | 6,790 | 7,677
Applicable income tax (provision) benefits | (25,516) | (25,274) | (48,561)
Net Income | 105,333 | 107,498 | 55,165
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 8 | 1 | 1
Dividends from subsidiaries | 55,964 | 81,851 | 52,586
Interest expense | (3,735) | (3,722) | (3,000)
Other income | 6 | 14 | 17
Operating expense | (4,525) | (4,047) | (4,767)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 47,718 | 74,097 | 44,837
Applicable income tax (provision) benefits | 1,720 | 1,324 | 2,557
Income (loss) before equity in undistributed earnings of subsidiaries | 49,438 | 75,421 | 47,394
Equity in undistributed (loss) earnings of subsidiaries | 55,895 | 32,077 | 7,771
Net Income | $ 105,333 | $ 107,498 | $ 55,165

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