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Loans - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) loan | Jun. 30, 2016 USD ($) loan | Jun. 30, 2017 USD ($) loan | Jun. 30, 2016 USD ($) loan | Dec. 31, 2017 loan | 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 | 0
Unadvanced commitments on impaired loans |  |  |  |  |  | $ 0
Specific reserves on restructured loans | $ 733,899.000000 |  | $ 733,899.000000 |  |  |
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 | $ 676,000 | $ 2,320,000 | $ 676,000 | $ 2,609,000 |  |
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 2 | 1 | 4 |  |
Financing Receivable, Gross | $ 3,811,345,000 |  | $ 3,811,345,000 |  |  | 3,119,154,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan | 3 |  | 3 |  |  |
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 | $ 151,670,000 |  | $ 151,670,000 |  |  | $ 156,182,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan | 0 |  | 0 |  |  |

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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=84173941&loc=SL6953676-111524 + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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