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Loans Receivable - Additional Information (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2021
USD ($)
loan
Sep. 30, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivables for loans $ 47,106 $ 46,234
Loans pledged to secure borrowings from the Federal Home Loan Bank 7,175,190 $ 5,930,015
Nonaccrual interest income recognized 1,250  
Impaired, interest income on accrual accrual and performed loans $ 328  
Basis point reduction, minimum 1.00%  
Basis point reduction, maximum 2.00%  
Percent of TDRs classified as performing 97.40%  
Single family residential loans as percentage of restructured loans 92.20%  
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 $ 60,326  
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans modified | loan 1  
Total loans modified $ 475  
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans modified | loan 16  
Total loans modified $ 3,526