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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Finite-Lived Intangible Assets (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 6,261
2019 5,343
2020 4,317
2021 3,238
2022 2,318
Core Deposits  
Finite-Lived Intangible Assets [Line Items]  
2018 6,130
2019 5,212
2020 4,186
2021 3,107
2022 2,187
Customer Relationship Intangible  
Finite-Lived Intangible Assets [Line Items]  
2018 131
2019 131
2020 131
2021 131
2022 $ 131