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REVENUE RECOGNITION REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract] |  |
Interchange income | $ 30.4 | $ 31.3
Credit card expense | $ 11.9 | $ 11.0

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 Gross Interchange income received on credit and debit cards. + References No definition available. + Details
Name: | ffbc_Interchangeincome
Namespace Prefix: | ffbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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