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Loans (Additional Information) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
May 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans at fair value $ 2,320,574,000   $ 2,320,574,000     $ 2,125,944,000
Loans 2,340,173,000   2,340,173,000     2,145,019,000
Loans, fair value discounts $ 3,548,000   $ 3,548,000     3,381,000
Number of loans modified as troubled debt restructurings | loan 0 0 0 2    
Additional lending amount to customers whose loan terms has been modified in troubled debt restructuring $ 0   $ 0     0
Increase in allowance for loan losses for troubled debt restructuring loans     0 $ 10,000    
Charge-offs due to troubled debt restructurings     $ 0 $ 0    
Number of loans modified as troubled debt restructuring subsequently defaulted | loan 0 0 0 0    
Threshold amount to individually classify loans by credit risk $ 250,000   $ 250,000      
Carrying amount of consumer mortgage loans secured by residential real estate properties 60,000   60,000     $ 14,000
Loans Acquired With Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Increase in allowance for loan losses 0 $ 0 30,000 $ 11,000    
Reversal of allowance for loan losses 3,000 $ 54,000 6,000 $ 110,000    
First Financial Bancorp            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans at fair value 112,873,000   112,873,000   $ 117,604,000  
Loans 115,523,000   115,523,000   120,484,000  
Loans, fair value discounts $ 2,650,000   $ 2,650,000   2,880,000  
First Financial Bancorp | Loans Acquired With No Deteriorated Credit Quality            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans at fair value         $ 0