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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Commitments and Contingencies Disclosure [Line Items]        
Reserves for unfunded commitments $ 12,500 $ 600    
Loans and Leases Receivable, Commitments, Fixed Rates 123,600 123,700    
Loans and Leases Receivable, Commitments, Variable Rates $ 3,300,000 $ 3,200,000    
Loan Commitments, Fixed Interest Rate Range, Minimum 0.00% 0.00%    
Loan Commitments, Fixed Interest Rate Range, Maximum 21.00% 21.00%    
Loan Commitments, Fixed Rate, Maturities, Minimum 1 year 1 year    
Loan Commitments, Fixed Rate, Maturities, Maximum 30 years 9 months 18 days 31 years 7 months 6 days    
Letters of credit issued to guarantee performance of a client to a third party $ 36,100 $ 33,400    
Affordable Housing Program Obligation 47,500 38,500    
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 13,064 10,075 $ 5,439  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 8,100 6,900 5,700  
Affordable housing contingent commitment 0 0    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount 4,000 5,100    
Estimated Litigation Liability       $ 0
Renewable Energy Recorded Investment 5,200      
Renewable Energy Maximimum Exposure to Loss 7,700      
Variable Interest Entity, Not Primary Beneficiary [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Historic Tax Credit Recorded Investment 3,600 3,100    
Commitments to Extend Credit        
Commitments and Contingencies Disclosure [Line Items]        
Commitments outstanding to extend credit 3,400,000 3,300,000    
Affordable housing investment [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 7,600 6,200 4,900  
Historic tax credit [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Effective Income Tax Rate Reconciliation, Tax Credit, Amount 600 $ 3,500 $ 500  
FFBC_RenewableEnergyProgramMember [Member]        
Commitments and Contingencies Disclosure [Line Items]        
Effective Income Tax Rate Reconciliation, Tax Credit, Amount $ 4,800