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Subsequent Events (Details)
$ in Millions
1 Months Ended
May 18, 2018
USD ($)
office
Mar. 31, 2018
office
Subsequent Event [Line Items]    
Number of banking offices   53
Scenario, Forecast | Subsequent Event | MainSource Bank    
Subsequent Event [Line Items]    
Purchase price, percentage of certain checking and other demand withdrawal accounts 8.00%  
Purchase price, percentage of balances of governmental accounts with public funds, excluding time deposits 4.50%  
Purchase price, percentage of balances of money market and saving deposits, excluding governmental accounts with public funds 4.50%  
Period adjustment for consideration transferred following closing date 6 months  
Scenario, Forecast | Subsequent Event | MainSource Bank | Core Deposit Intangible    
Subsequent Event [Line Items]    
Expected premium to be paid for deposits under the purchase agreement | $ $ 8  
Scenario, Forecast | Subsequent Event | MainSource Bank | INDIANA    
Subsequent Event [Line Items]    
Number of banking offices 5  
Scenario, Forecast | Subsequent Event | MainSource Bank | Columbus, Indiana    
Subsequent Event [Line Items]    
Number of banking offices 4  
Deposits acquired | $ $ 160  
Loans acquired | $ $ 134  
Scenario, Forecast | Subsequent Event | MainSource Bank | Greensburg, Indiana    
Subsequent Event [Line Items]    
Number of banking offices 1