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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Finite-Lived Intangible Assets (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 8,096
2020 7,070
2021 5,991
2022 5,071
2023 4,175
Core Deposit Intangibles  
Finite-Lived Intangible Assets [Line Items]  
2019 7,965
2020 6,939
2021 5,860
2022 4,940
2023 4,044
Customer relationship intangible  
Finite-Lived Intangible Assets [Line Items]  
2019 131
2020 131
2021 131
2022 131
2023 $ 131