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Loans And Allowance For Loan Losses (Loans Held For Investment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Loan Portfolio [Line Items]    
Deferred loan expenses, net $ 44,941 $ 41,976
Loans in process (LIP) (27,127) (25,743)
Allowance for loan losses (44,387) (38,913)
Loans, net 13,574,454 13,195,745
Other Loans    
Loan Portfolio [Line Items]    
Loans, gross 2,700 3,166
Real Estate Loans    
Loan Portfolio [Line Items]    
Loans, gross 13,598,327 13,215,259
Real Estate Loans | Residential Core    
Loan Portfolio [Line Items]    
Loans, gross 11,148,838 10,903,024
Real Estate Loans | Residential Home Today    
Loan Portfolio [Line Items]    
Loans, gross 80,401 84,942
Real Estate Loans | Home Equity Loans And Lines Of Credit    
Loan Portfolio [Line Items]    
Loans, gross 2,316,519 2,174,961
Real Estate Loans | Construction    
Loan Portfolio [Line Items]    
Loans, gross $ 52,569 $ 52,332