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Portfolio Loans - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 USD ($) loan | Sep. 30, 2015 USD ($) loan | Sep. 30, 2016 USD ($) loan | Sep. 30, 2015 USD ($) loan | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans over 90 days past due and still accruing interest | loan | 0 |  | 0 |  |  | 0
Unadvanced commitments on impaired loans | $ 500,000 |  | $ 500,000 |  |  | $ 0
Specific reserves on restructured loans | 1,196,000.000 |  | $ 1,196,000.000 |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan |  |  | 0 | 0 |  |
Unadvanced Commitment on Impaired Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Estimated losses attributable to unadvanced commitments on impaired loans |  |  |  |  | $ 300,000 | 300,000
Non-Covered Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Post-Modification Outstanding Recorded Balance | $ 0 | $ 0 | $ 2,609,000 | $ 0 |  |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 | 4 | 0 |  |
Financing Receivable, Gross | $ 3,038,137,000 |  | $ 3,038,137,000 |  |  | 2,750,446,000
Non-Covered Loans | Consumer and other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Post-Modification Outstanding Recorded Balance | $ 0 | $ 0 | $ 0 | $ 0 |  |
Financing Receivable, Modifications, Number of Contracts | loan | 0 | 0 | 0 | 0 |  |
Financing Receivable, Gross | $ 160,535,000 |  | $ 160,535,000 |  |  | $ 137,537,000

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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