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Basis of Accounting and Consolidation Basis of Accounting and Consolidation (Acquisitions)
 6 Months Ended
Jun. 12, 2018
USD ($)
$ / shares
shares
May 01, 2018
USD ($)
$ / shares
shares
Dec. 11, 2017
$ / shares
shares
Sep. 08, 2016
USD ($)
Jun. 30, 2018
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Agreement And Plan Of Merger [Abstract]              
Common stock, par value (in dollars per share) | $ / shares         $ 4   $ 4
Assets | $         $ 3,369,473,000   $ 2,841,539,000
Gross loans | $         2,387,345,000   1,946,114,000
Deposits | $         2,670,864,000   $ 2,274,639,000
Aggregate Total Of Cash Paid In Business Combination | $         $ 10,275,000 $ 0  
First BancTrust [Member]              
Agreement And Plan Of Merger [Abstract]              
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        
Right To Receive Value Of Share Option | shares     0.800        
Shares, Issued | shares   1,643,900          
Shares Issued, Price Per Share | $ / shares   $ 37.32          
Aggregate Total Of Cash Paid In Business Combination | $   $ 10,275,000   $ 10,275,000      
SBC Bancorp [Member]              
Agreement And Plan Of Merger [Abstract]              
Percent Of Acquiree Outstanding Stock Being Acquired In Merger 1.00            
Par Value Of Outstanding Stock Being Acquired In Merger | $ / shares $ 7.50            
Right To Receive Value of Cash Option | $ / shares $ 307.93            
Right To Receive Value Of Share Option | shares 8.023            
Dividends, Cash | $ $ 25,000,000