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Condensed Financial Information of First Commonwealth Financial Corporation (Parent Company Only) - Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Condensed Consolidating Statement Of Operation [Line Items] |  |  |
Interest and dividends | $ 219,075 | $ 231,545 | $ 268,360
Interest expense | (30,146) | (41,678) | (61,599)
Other income | 13,610 | 12,803 | 10,016
Applicable income tax benefits | (14,658) | 380 | (239)
Net Income | 41,954 | 15,274 | 22,978
Parent [Member] |  |  |
Schedule Of Condensed Consolidating Statement Of Operation [Line Items] |  |  |
Interest and dividends | 1 | 1 | 1
Dividends from subsidiaries | 64,342 | 10,321 | 3,190
Interest expense | (5,711) | (5,605) | (5,658)
Other income | 12,581 | 30,595 | 28,789
Operating expense | (19,061) | (44,057) | (42,786)
Income (loss) before taxes and equity in undistributed earnings of subsidiaries | 52,152 | (8,745) | (16,464)
Applicable income tax benefits | 4,364 | 6,618 | 6,790
Income (loss) before equity in undistributed earnings of subsidiaries | 56,516 | (2,127) | (9,674)
Equity in undistributed (loss) earnings of subsidiaries | (14,562) | 17,401 | 32,652
Net Income | $ 41,954 | $ 15,274 | $ 22,978

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