Huntington Bancshares Incorporated Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Detail Textuals)	3 Months Ended
Subsequent Event (Detail Textuals)	Sep. 30, 2013
Subsequent Event Line Items
Subsequent Event Description	On October 10, 2013, Huntington announced the signing of a definitive agreement to acquire Camco Financial, the parent company of Cambridge Ohio-based Advantage Bank, in a cash and stock transaction valued at approximately $97 million. As of June 30, 2013, Camco operated 22 banking offices throughout eastern and southern Ohio with $0.8 billion in total assets and $0.6 billion in total deposits. The transaction is expected to be completed in the first half of 2014, subject to the satisfaction of customary closing conditions, including regulatory approvals and the approval of the shareholders of Camco Financial. Given the size and structure, the transaction has a de minimis impact to tangible book value. With over 45% geographic overlap, Huntington expects the acquisition to be accretive to earnings per share in the first full year.