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Interest Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 48,857 $ 47,295
Loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 41,429 39,176
Mortgage-backed securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 6,107 6,404
Investment securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 1,321 $ 1,715