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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | $ 293,838 | $ 301,209 | $ 325,264
Interest expense | (15,297) | (32,938) | (55,402)
Other income | 8,185 | 7,892 | 7,268
Applicable income tax (provision) benefits | (34,560) | (16,756) | (25,516)
Net Income | 138,257 | 73,447 | 105,333
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest and dividends | 4 | 8 | 8
Dividends from subsidiaries | 72,202 | 61,708 | 55,964
Interest expense | (3,205) | (3,229) | (3,735)
Other income | 0 | 3 | 6
Operating expense | (4,721) | (4,687) | (4,525)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 64,280 | 53,803 | 47,718
Applicable income tax (provision) benefits | 1,646 | 1,648 | 1,720
Income (loss) before equity in undistributed earnings of subsidiaries | 65,926 | 55,451 | 49,438
Equity in undistributed (loss) earnings of subsidiaries | 72,331 | 17,996 | 55,895
Net Income | $ 138,257 | $ 73,447 | $ 105,333

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