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Employee Stock Ownership Plan (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2021
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares Held In Employee Stock Ownership Plan, Allocated 165,198      
Compensation expense related to the ESOP including dividends $ 2,000 $ 3,100 $ 2,900  
Portion of compensation expense related to the ESOP attributable to changes in Company stock price 336 549 541  
Dividends on unallocated ESOP shares in excess of debt service payments $ 0 $ 906 $ 688  
Forecast [Member]        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Shares Held In Employee Stock Ownership Plan, Committed-to-be-Released       165,198
Minimum [Member]        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Percentage of ESOP shares participant may diversify once age requirement is met 25.00%      
Required age of participant in order to diversify ESOP shares, years 50      
IPO [Member]        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Number of shares acquired by ESOP trust 3,024,574      
Number of shares acquired by ESOP post corporate reorganization 6,846,728      
ESOP loan maturity date Sep. 30, 2013      
Corporate Reorganization [Member]        
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]        
Number of shares acquired by ESOP trust 4,726,000      
ESOP loan maturity date Sep. 30, 2040