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Loans Held for Sale - Schedule of Loans Held for Sale at Lower Cost or Fair Value Activity (Footnote) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Ginnie Mae Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans repurchase obligation $ 28.1 $ 98.7