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Subsequent Event (Notes) | 3 Months Ended
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Mar. 31, 2017
Subsequent Event [Line Items] |
Subsequent Events [Text Block] | Subsequent Events On April 3, 2017, the Company completed its acquisition of DCB Financial Corporation ("DCB") and its banking subsidiary, The Delaware County Bank and Trust Company. DCB has approximately $550 million in assets and operates nine full-service banking offices which will operate under the First Commonwealth name. On March 31, 2017, the Company funded $21.3 million of the purchase price for this acquisition into an escrow account pending the closing on April 3, 2017. As of March 31, 2017, these funds were classified as restricted cash and are included in the "Other assets" line in the Condensed Consolidated Statements of Financial Condition.

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Definition The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business. + References No definition available. + Details
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