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Capital	12 Months Ended
	Dec. 31, 2017
Disclosure Capital Additional Information [Abstract]
Capital	Capital In 2012, First Commonwealth announced a $50.0 million common stock repurchase program. Additional share repurchase programs were authorized for up to $25.0 million in shares of the Company’s common stock for each year from 2013 to 2016. The repurchase program was suspended in July 2016 as a result of the acquisition of thirteen branches in northern Ohio which management believes represents a better use of capital for shareholder. Repurchases under all programs resulted in a total of 16,665,735 shares repurchased at an average price of $7.55 per share.

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Disclosure - Capital - Additional Information [Abstract]

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No definition available.

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The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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