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Business Combinations Business Combinations Narrative (Details)
 9 Months Ended
May 01, 2018
USD ($)
$ / shares
shares
Dec. 11, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 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        
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 363,281,000        
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 $ 26,491,000 $ 26,500,000 $ 26,500,000    
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