OTHER LONG-TERM DEBT - Additional Information (Detail) (First Financial (OH) Statutory Trust II, USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011
First Financial (OH) Statutory Trust II
Debt Disclosure [Line Items]
Capital securities issued by a statutory business trust	third quarter of 2003
Debentures first eligible for early redemption	September of 2008
Debentures redeemed	Jun. 30, 2011
Debenture limit of qualifying Tier I capital	25.00%
Capacity to issue additional debentures under these guidelines	$ 167.3

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Subparagraph b

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant