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Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
Changes in the carrying amount of the Company's intangible assets, which are included in other assets on the consolidated balance sheet, are presented in the following table.
Core Deposit and
 Goodwill Other Intangibles
 (Dollars in thousands)
Balance at September 30, 2017$—  $— 
Acquisition of CCB7,989   10,052 
Less: Amortization— (234)
Balance at September 30, 20187,989  9,819 
Purchase accounting adjustments1,335  — 
Less: Amortization—  (2,316)
Balance at September 30, 20199,324  7,503 
Purchase accounting adjustments— — 
Less: Amortization— (1,964)
Balance at September 30, 2020$9,324 $5,539 
Schedule of Core Deposit and Other Intangible Assets, Future Amortization Expense
The estimated amortization expense for the next five years related to the core deposit and other intangible assets as of September 30, 2020 is presented in the following table (dollars in thousands):
2021$1,659 
20221,358 
20231,056 
2024761 
2025509