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Goodwill and Other Intangible Assets - Textual (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Apr. 12, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 926,450   $ 845,687
Finite-Lived Intangible Assets [Line Items]      
Core deposit premiums $ 104,096   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 $ 93,098   $ 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 $ 80,800 $ 80,763  
Reliance Bancshares, Inc. | Core Deposit Premium      
Finite-Lived Intangible Assets [Line Items]      
Core deposit premiums $ 18,400