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Goodwill and Core Deposit Intangibles - Estimated Aggregate Future Amortization Expense for Core Deposit Intangibles (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]    
Remaining 2016 $ 2,226  
2017 6,942  
2018 5,959  
2019 5,051  
2020 4,483  
Thereafter 23,349  
Total $ 48,010 $ 49,417