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Goodwill and Core Deposit Intangibles - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Intangible Assets And Goodwill [Line Items]      
Total $ 45,784 $ 49,417  
Core Deposits [Member]      
Schedule Of Intangible Assets And Goodwill [Line Items]      
2017 6,942    
2018 5,959    
2019 5,051    
2020 4,483    
Thereafter 23,349    
Total $ 45,784 $ 49,417 $ 58,947