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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