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REVENUE RECOGNITION (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Revenue Recognition [Abstract] |  |
Interchange income | $ 7.7 | $ 7.1
Credit card expense | 4.1 | 3.8
Spot foreign exchange income | $ 3.1 | $ 2.7

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- 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

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- 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
- Definition Foreign exchange income on spot transactions + References No definition available. + Details
Name: | ffbc_SpotForeignExchangeIncome
Namespace Prefix: | ffbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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