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Subsequent Event (Notes)	3 Months Ended
Subsequent Event (Notes)	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Event On May 1, 2018, the Company completed its acquisition of Garfield Acquisition Corp., and its banking subsidiary, Foundation Bank. Foundation has approximately $207 million in assets and operates five full-service banking offices which will operate under the First Commonwealth name.