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Securities Available for Sale - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
security
Investments, Debt and Equity Securities [Abstract]          
Proceeds from sales of securities available for sale $ 0 $ 48,400,000 $ 0 $ 145,627,000  
Gross gains realized 0 300,000 0 300,000  
Gross loss realized 0 0.0 0 500,000  
Other than temporary impairment losses recognized in earnings 0 $ 0 0 $ 0  
Securities pledged as collateral $ 1,050,000,000.00   $ 1,050,000,000.00   $ 863,900,000
Percentage of investment portfolio in continuous loss position (as a percent) 6.00%   6.00%   36.00%
Number of securities in an unrealized loss position (securities) | security 17   17   169