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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process $ 1,054,513 $ 879,484
Loans and Leases Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans in process $ 1,752,652 $ 1,278,829