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Subsequent Event (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Feb. 28, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets   $ 1,588,932 $ 1,553,133
Subsequent Event [Member] | Common Stock      
Share price $ 35.70    
Subsequent Event [Member] | Universal Bancorp [Member] | Common Stock      
Acquirees number of shares of acquirers common stock per share of acquirees shares 15.6    
Business acquisition, share price $ 250.00    
Transaction value for the shares of MutualFirst's common stock $ 61,300    
Universal Bancorp [Member]      
Assets   $ 389,400