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Loans Receivable - Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2021
USD ($)
loan
business
Sep. 30, 2020
USD ($)
business
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable for loans $ 46,234 $ 48,704
Loans pledged to secure borrowings from the Federal Home Loan Bank $ 5,930,015 $ 5,361,504
Number of businesses assisted, CARES Act | business 2,500 6,500
Approximate rate reduction concession, minimum 1.00%  
Approximate rate reduction concession, maximum 2.00%  
TDRs that subsequently defaulted, recorded investment $ 65,128 $ 91,408
Percent of restructured loans performing 97.70%  
Single family residential loans as percentage of restructured loans 92.10%  
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 $ 320,000 780,000
Number of PPP loans forgiven | loan 7,000  
Amount of PPP loans forgiven $ 773,000  
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 $ 142,806 $ 112,812
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 18  
Total loans modified $ 5,600  
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans approved for deferrals, CARES Act | loan 221