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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Gross Carrying Value [Abstract]          
Goodwill not subject to amortization $ 108,752   $ 108,752 $ 109,037  
Intangibles from branch acquisition 3,015   3,015 3,015  
Core deposit intangibles 32,355   32,355 32,355  
Customer list intangibles 16,129   16,129 16,029  
Total Goodwill and Intangible Assets, Gross Carrying Value 160,251   160,251 160,436  
Goodwill and Intangible Assets Accumulated Amortization [Abstract]          
Goodwill not subject to amortization (effective 1/1/02), Accumulated Amortization 3,760   3,760 3,760  
Total Goodwill and Intangible Assets, Accumulated Amortization 28,438   28,438 23,440  
Total Amortization Expense [Abstract]          
Amortization of intangible assets     5,848 3,215 $ 2,153
Estimated amortization expense [Abstract]          
For year ended 12/31/20 4,917   4,917    
For year ended 12/31/21 4,253   4,253    
For year ended 12/31/22 3,829   3,829    
For year ended 12/31/23 3,516   3,516    
For year ended 12/31/24 2,977   $ 2,977    
Weighted Average Amortization Period For Intangibles     4 years 120 days    
Goodwill, Acquired During Period 18,351        
First BancTrust [Member]          
Estimated amortization expense [Abstract]          
Goodwill, Acquired During Period   $ 26,491 $ 26,500    
Intangibles from branch acquisitions          
Goodwill and Intangible Assets Accumulated Amortization [Abstract]          
Intangible Assets, Accumulated Amortization 3,015   3,015 3,015  
Core deposit intangibles          
Goodwill and Intangible Assets Accumulated Amortization [Abstract]          
Intangible Assets, Accumulated Amortization 17,746   17,746 14,017  
Total Amortization Expense [Abstract]          
Amortization of intangible assets     $ 3,729 2,544 1,829
Estimated amortization expense [Abstract]          
Weighted Average Amortization Period For Intangibles     3 years 212 days    
Customer list intangibles          
Goodwill and Intangible Assets Accumulated Amortization [Abstract]          
Intangible Assets, Accumulated Amortization $ 3,917   $ 3,917 2,648  
Total Amortization Expense [Abstract]          
Amortization of intangible assets     $ 1,269 363 183
Estimated amortization expense [Abstract]          
Weighted Average Amortization Period For Intangibles     5 years 99 days    
Mortgage Servicing Rights [Member]          
Total Amortization Expense [Abstract]          
Amortization of intangible assets     $ 850 $ 308 $ 141