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Subsequent Events (Details) - Scenario, Forecast - Subsequent Event - MainSource Bank
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
office
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
Core Deposit Intangible  
Subsequent Event [Line Items]  
Expected premium to be paid for deposits under the purchase agreement | $ $ 8
INDIANA  
Subsequent Event [Line Items]  
Number of banking offices | office 5
Columbus, Indiana  
Subsequent Event [Line Items]  
Number of banking offices | office 4
Deposits acquired | $ $ 160
Loans acquired | $ $ 134
Greensburg, Indiana  
Subsequent Event [Line Items]  
Number of banking offices | office 1