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Loans Receivable - Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2022
USD ($)
loan
business
Sep. 30, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable for loans $ 57,070 $ 46,234
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest receivable Interest receivable
Loans pledged to secure borrowings from the Federal Home Loan Bank $ 8,224,951 $ 5,930,015
Number of businesses assisted, CARES Act | business 9,000  
Amount of PPP loans receivables $ 10,141  
Approximate rate reduction concession, minimum 1.00%  
Approximate rate reduction concession, maximum 2.00%  
TDRs that subsequently defaulted, recorded investment $ 56,817 65,128
Percent of restructured loans performing 98.30%  
Single family residential loans as percentage of restructured loans 82.50%  
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 12 months  
SBA Payroll Protection Program, CARES Act    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Amount of PPP loans authorized, CARES Act $ 1,085,000  
Number of PPP loans forgiven | loan 8,800  
Amount of PPP loans forgiven $ 1,075,000  
Financing Receivable from Related Party Including Unfunded Loan Commitment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans granted to officers, directors, and related interests $ 144,178 $ 142,806
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans approved for deferrals, CARES Act | loan 1,472  
Number of contracts | loan 1  
Total loans modified $ 64  
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans approved for deferrals, CARES Act | loan 221