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Business Combinations Business Combinations Narrative (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
$ / shares
Business Acquisition [Line Items]          
Common stock, par value (in dollars per share) | $ / shares     $ 4   $ 4
SCB Bancorp [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 $ 7.50        
Right To Receive Value of Cash Option | $ / shares $ 307.93        
Aggregate Total Of Cash Paid In Business Combination $ 19,046,000        
Right To Receive Value Of Share Option | shares 8.0228        
Dividends, Cash $ 25,000,000        
Total assets acquired 478,629,000        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans 247,561,000        
Deposits 347,971,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment $ 11,068,000        
Shares, Issued | shares 1,330,571        
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 $ 0 $ 10,275,000  
Right To Receive Value Of Share Option | shares   0.800      
Total assets acquired   $ 501,285,000 $ 0 $ 501,285,000  
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   363,281,000      
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      
Shares, Issued | shares   1,643,900      
Shares Issued, Price Per Share | $ / shares   $ 37.32      
Acquired Book Value [Member] | SCB Bancorp [Member]          
Business Acquisition [Line Items]          
Total assets acquired $ 457,324,000        
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans 255,429,000        
Deposits 348,314,000        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment $ 10,115,000        
Acquired Book Value [Member] | First BancTrust [Member]          
Business Acquisition [Line Items]          
Total assets acquired   $ 474,853,000      
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans   371,156,000      
Deposits   384,323,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment   $ 10,126,000