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Interest Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 47,295 $ 41,643
Loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 39,176 33,688
Mortgage-backed securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable 6,404 6,049
Investment securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest receivable $ 1,715 $ 1,906