ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Net charge-offs	$ 800	$ (500)
Provision for loan and lease losses	(100)	$ (283)
Allowance for covered loan losses	$ 9,400		$ 10,300

The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio on covered loans, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

No definition available.

Name:	ffbc_ProvisionForLoanAndLeaseLossesCovered
Namespace Prefix:	ffbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration