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Summary of Significant Accounting Policies - Future Amortization Expense of Core Deposits (Details) - Core deposit intangible
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 921
2019 887
2020 853
2021 818
2022 782
Thereafter 2,231
Total core deposit intangible amortization $ 6,492