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Subsequent events - Narrative (Details) - Mutual First Financial, Inc. - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Oct. 23, 2019
Sep. 30, 2019
Subsequent Event [Line Items]    
Acquisition pro forma assets   $ 2,074.0
Acquisition pro forma net income   $ 17.1
Subsequent Event    
Subsequent Event [Line Items]    
Entity shares issued per acquiree share (in shares) 2.4  
Value of stock issued for purchase $ 346.0  
Value of stock issued (in dollars per share) $ 39.89  
Stock price measurement period 15 days