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REVENUE RECOGNITION REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Revenue Recognition [Abstract] |  |
Fees and Commissions, Credit and Debit Cards | $ 8.1 | $ 13.5
Credit card expense | $ 2.8 | $ 4.8

X
- Definition Gross expense related to credit cards. + References No definition available. + Details
Name: | ffbc_Creditcardexpense
Namespace Prefix: | ffbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of income earned from credit card services (including late, over limit, and annual fees) and debit card services (including interchange fees, annual fees and other fees). Excludes interest income earned on credit card balances and transactions. + References No definition available. + Details
Name: | us-gaap_FeesAndCommissionsCreditAndDebitCards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration