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Goodwill and Other Intangible Assets - Schedule of Estimated Aggregate Amortization Expense of Core Deposit and Other Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 14,902 $ 4,563
Core Deposits    
Finite Lived Intangible Assets [Line Items]    
December 31, 2018 3,275  
December 31, 2019 2,866  
December 31, 2020 2,476  
December 31, 2021 2,090  
December 31, 2022 1,609  
Thereafter 2,586  
Net Carrying Amount $ 14,902