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Loans Receivable - Additional Information (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2023
USD ($)
portfolioSegment
Sep. 30, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of portfolio segments | portfolioSegment 2  
Accrued interest receivables for loans $ 71,830 $ 57,070
Loans pledged to secure borrowings from the Federal Home Loan Bank 8,867,524 $ 8,224,951
Nonaccrual interest income recognized 1,039  
Impaired, interest income on accrual accrual and performed loans $ 761  
Basis point reduction, minimum 1.00%  
Basis point reduction, maximum 2.00%  
Percent of TDRs classified as performing 97.70%  
Single family residential loans as percentage of restructured loans 81.90%  
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term for payment and rate reduction 6 months  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Term for payment and rate reduction 24 months  
Performing Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructuring, amount $ 52,051