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Core Deposits and Other Intangibles - Schedule of Future Amortization Expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2021 $ 1,014  
2022 929  
2023 831  
2024 742  
2025 683  
2026 and thereafter 1,965  
Net intangible assets $ 6,164 $ 6,174