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Basis of Accounting and Consolidation Basis of Accounting and Consolidation (Acquisitions) (Details)
 6 Months Ended
Nov. 15, 2018
USD ($)
$ / shares
shares
May 01, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Agreement And Plan Of Merger [Abstract]          
Common stock, par value (in dollars per share) | $ / shares     $ 4   $ 4
Assets | $     $ 3,842,841,000   $ 3,839,734,000
Gross loans | $     2,554,713,000   2,658,136,000
Deposits | $     3,012,490,000   $ 2,988,686,000
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 $ 0 $ 10,275,000  
SCB 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 8.0228        
Shares, Issued | shares 1,330,571        
Aggregate Total Of Cash Paid In Business Combination | $ $ 19,046,000        
Dividends, Cash | $ $ 25,000,000