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Goodwill and Other Intangible Assets - Textual (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Apr. 12, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill $ 926,648     $ 845,687
Finite-Lived Intangible Assets [Line Items]        
Core deposit premiums $ 101,149     91,334
Minimum        
Finite-Lived Intangible Assets [Line Items]        
Useful life 10 years      
Maximum        
Finite-Lived Intangible Assets [Line Items]        
Useful life 15 years      
Core Deposit Premium        
Finite-Lived Intangible Assets [Line Items]        
Core deposit premiums $ 90,416     $ 79,807
Core Deposit Premium | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Useful life 10 years      
Core Deposit Premium | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Useful life 15 years      
Reliance Bancshares, Inc.        
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill   $ 81,000 $ 80,961  
Reliance Bancshares, Inc. | Core Deposit Premium        
Finite-Lived Intangible Assets [Line Items]        
Core deposit premiums $ 18,400