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Securities Available for Sale - Narrative (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
security
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
security
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
security
Investments, Debt and Equity Securities [Abstract]          
Proceeds from sales of securities available for sale $ 0.0 $ 0.0 $ 0 $ 97,212,000  
Gross gains realized 0   0    
Gross loss realized       500,000  
Other than temporary impairment losses recognized in earnings 0 $ 0 0 $ 0  
Securities pledged as collateral $ 918,800,000   $ 918,800,000   $ 863,900,000
Percentage of investment portfolio in continuous loss position (as a percent) 12.00%   12.00%   36.00%
Number of securities in an unrealized loss position (securities) | security 58   58   169