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Portfolio Loans - Narrative (Details)
$ in Millions
Dec. 31, 2016
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of loans over 90 days past due and still accruing interest | loan 0
Specific reserves on restructured loans $ 0.7
Unadvanced Commitment on Impaired Loan  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Estimated losses attributable to unadvanced commitments on impaired loans $ 0.3