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Portfolio Loans - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) loan | Jun. 30, 2015 USD ($) loan | Jun. 30, 2016 USD ($) loan | Jun. 30, 2015 USD ($) loan | 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 | $ 100,000 |  | $ 100,000 |  | $ 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 |  | 300,000
Non-Covered Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Balance | $ 2,320,000 | $ 0 | $ 2,609,000 | $ 0 |
Financing Receivable, Modifications, Number of Contracts | loan | 2 | 0 | 4 | 0 |
Financing Receivable, Gross | $ 2,884,159,000 |  | $ 2,884,159,000 |  | 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 | $ 161,417,000 |  | $ 161,417,000 |  | $ 137,537,000

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