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Loans Receivable - Narrative (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2020
USD ($)
loan
branch
Sep. 30, 2020
USD ($)
branch
Sep. 30, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable for loans $ 48,704 $ 48,704 $ 41,429
Loans pledged to secure borrowings from the Federal Home Loan Bank $ 5,361,504 $ 5,361,504 5,874,704
Number of businesses assisted, CARES Act | branch 6,500 6,500  
Approximate rate reduction concession, minimum   1.00%  
Approximate rate reduction concession, maximum   2.00%  
TDRs that subsequently defaulted, recorded investment $ 91,408 $ 91,408 121,677
Percent of restructured loans performing 97.40% 97.40%  
Single family residential loans as percentage of restructured loans 93.60% 93.60%  
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   $ 780,000  
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   112,812 $ 76,288
Consumer loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of contracts | loan 612    
Total loans modified $ 171,000 171,000  
Commercial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of contracts | loan 69    
Total loans modified $ 167,000 $ 167,000