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Loans Held for Sale - Narrative (Details) - Line of Credit [Member]
$ in Millions
Sep. 30, 2017
USD ($)
Lending [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Collateral $ 190.8
Servicing [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Collateral $ 8.2