XML 20 R48.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Variable Interest Entities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Schedule of Maximum Potential Exposure | First Commonwealth’s maximum potential exposure is equal to its carrying value and is summarized in the table below as of December 31:
|  | 2012 |  |  | 2011 |
|  | (dollars in thousands) |
Low Income Housing Limited Partnership Investments |  | $ | 347 |  |  | $ | 667 |

X
- Definition Schedule of maximum potential exposure. + References No definition available. + Details
Name: | fcf_ScheduleOfMaximumPotentialExposureTableTextBlock
Namespace Prefix: | fcf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration