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Summary of Significant Accounting Policies - Future Amortization Expense of Core Deposits (Details) - Core deposit intangible
$ in Thousands
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2017 $ 472
2018 413
2019 388
2020 365
2021 343
Thereafter 599
Total core deposit intangible amortization $ 2,580