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Business Combinations Business Combinations Narrative (Details)
 6 Months Ended
May 01, 2018
USD ($)
$ / shares
shares
Dec. 11, 2017
USD ($)
$ / shares
shares
Sep. 08, 2016
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
$ / shares
Business Acquisition [Line Items]            
Aggregate Total Of Cash Paid In Business Combination       $ 10,275,000 $ 0  
Common stock, par value (in dollars per share) | $ / shares       $ 4   $ 4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets       $ 501,285,000    
First BancTrust [Member]            
Business Acquisition [Line Items]            
Percent Of Acquiree Outstanding Stock Being Acquired In Merger   1.00        
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares   $ 0.01        
Right To Receive Value of Cash Option | $ / shares   $ 5.00        
Aggregate Total Of Cash Paid In Business Combination $ 10,275,000   $ 10,275,000      
Right To Receive Value Of Share Option | shares   0.800        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     501,285,000      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans     362,858,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits     385,624,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment     9,437,000      
Goodwill, Acquired During Period $ 27,354,000 $ 27,400,000        
Shares, Issued | shares 1,643,900          
Shares Issued, Price Per Share | $ / shares $ 37.32          
Acquired Book Value [Member] | First BancTrust [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     474,853,000      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans     371,156,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits     384,323,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment     $ 10,126,000