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Goodwill and Core Deposit Intangibles - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Net carrying value at beginning of period $ 212,820 $ 204,500 $ 205,600
Acquisitions and measurement period adjustments 231,900 8,300 (1,100)
Net carrying value at end of period $ 444,704 $ 212,820 $ 204,500