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Goodwill and Other Intangible Assets - Textual (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Oct. 31, 2019
Oct. 30, 2019
Apr. 12, 2019
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 1,075,305,000 $ 1,055,520,000      
Goodwill impairment $ 0        
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 | 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        
Landrum Company          
Finite-Lived Intangible Assets [Line Items]          
Goodwill   131,300,000 $ 151,125,000 $ 407,000  
Goodwill increase $ 19,800,000        
Reliance Bancshares, Inc.          
Finite-Lived Intangible Assets [Line Items]          
Goodwill   $ 78,500,000     $ 78,493,000