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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Financing Receivables (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($)
Commercial & Industrial |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum | $ 250,000

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- Definition Restructured Loans, Loan Relationships, Review Threshold Amount Minimum for commercial and other loans greater than $250,000 + References No definition available. + Details
Name: | ffbc_RestructuredLoansLoanRelationshipsReviewThresholdAmountMinimum
Namespace Prefix: | ffbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |