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Interest Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 50,636 $ 53,799
Loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 46,234 48,704
Mortgage-backed securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 2,159 3,071
Investment securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 2,243 $ 2,024