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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 301,209 | $ 325,264 | $ 292,257
Interest expense | (32,938) | (55,402) | (40,035)
Other income | 7,892 | 7,268 | 6,790
Applicable income tax (provision) benefits | (16,756) | (25,516) | (25,274)
Net Income | 73,447 | 105,333 | 107,498
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 8 | 8 | 1
Dividends from subsidiaries | 61,708 | 55,964 | 81,851
Interest expense | (3,229) | (3,735) | (3,722)
Other income | 3 | 6 | 14
Operating expense | (4,687) | (4,525) | (4,047)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 53,803 | 47,718 | 74,097
Applicable income tax (provision) benefits | 1,648 | 1,720 | 1,324
Income (loss) before equity in undistributed earnings of subsidiaries | 55,451 | 49,438 | 75,421
Equity in undistributed (loss) earnings of subsidiaries | 17,996 | 55,895 | 32,077
Net Income | $ 73,447 | $ 105,333 | $ 107,498

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