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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Finite-Lived Intangible Assets (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2017 $ 6,530
2018 6,261
2019 5,343
2020 4,317
2021 3,238
Core Deposit Intangibles  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2017 6,399
2018 6,130
2019 5,212
2020 4,186
2021 3,107
Customer Relationship Intangible  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
2017 131
2018 131
2019 131
2020 131
2021 $ 131