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Mergers and Acquisitions - Narrative (Details)
$ in Thousands
Sep. 01, 2018
USD ($)
branch
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Goodwill resulting from merger   $ 939,683 $ 932,928 $ 611,046
Brand Group Holdings, Inc.        
Business Acquisition [Line Items]        
Transaction value $ 474,453      
Shares issued to common shareholders (in shares) | shares 9,306,477      
Cash consideration paid $ 21,879      
Cash settlement for stock options, net of tax benefit $ 17,157      
Voting interest acquired (percent) 100.00%      
Number of locations acquired | branch 13      
Intangible assets, including goodwill $ 356,171      
Goodwill resulting from merger 328,637      
Core deposit intangible $ 27,534      
Weighted average useful life (in years) 10 years