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Significant Accounting Policies - Subsequent Events (Details) - Subsequent event
$ in Millions
3 Months Ended
Dec. 31, 2020
USD ($)
Center
Subsequent Event [Line Items]  
Number of banking centers consolidated | Center 12
Minimum  
Subsequent Event [Line Items]  
Non-operating pre-tax expenses $ 7.0
Maximum  
Subsequent Event [Line Items]  
Non-operating pre-tax expenses $ 7.5