Expected reimbursements from the FDIC for losses on covered assets.

No definition available.

Name:	ffbc_FdicIndemnificationIncome
Namespace Prefix:	ffbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio on covered loans, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected).

+ References

No definition available.

+ Details

Name:	ffbc_ProvisionForLoanAndLeaseLossesCovered
Namespace Prefix:	ffbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Restructured Loans, Loan Relationships, Review Threshold Amount for non-impaired and impaired commercial loan relationships less than $250,000

+ References

No definition available.

+ Details

Name:	ffbc_RestructuredLoansLoanRelationshipsReviewThresholdAmountMaximum
Namespace Prefix:	ffbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=ffbc_NonCoveredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ALLOWANCE FOR LOAN AND LEASE LOSSES - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for loan and lease losses	$ 818,000	$ 1,715,000	$ (1,841,000)
FDIC loss sharing income	(1,563,000)	$ (2,487,000)	$ 365,000
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	250,000
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum	100,000
Residential real estate \| Non Covered Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Restructured loan relationships review threshold	$ 100,000