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Core Deposit Intangibles - Future Amortization Expense (Details) - Core deposit intangible assets
$ in Thousands
Mar. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 4,081
2020 4,851
2021 4,471
2022 4,218
2023 3,591
2024 and thereafter $ 5,983