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REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue Recognition [Abstract] |  |  |  |
Interchange income | $ 6.3 | $ 8.6 | $ 24.2 | $ 22.1
Credit card expense | $ 3.0 | $ 3.4 | $ 8.8 | $ 8.1

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_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration