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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
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