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Summary of Significant Accounting Policies - Future Amortization Expense of Core Deposits (Details) - Core deposit intangible
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Useful life of core deposit intangible asset 10 years
2020 $ 818
2021 782
2022 719
2023 422
2024 400
Thereafter 690
Total $ 3,831