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Loans - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loans over 90 days past due and still accruing interest | loan |  |  |  |  | 0
Unadvanced commitments on impaired loans |  |  |  |  | $ 0
Specific reserves on restructured loans | $ 2,600,000.0 |  | $ 2,600,000.0 |  |
Restructuring Reserve | 8,000,000 |  | 8,000,000 |  |
Unadvanced Commitment on Impaired Loan |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Estimated losses attributable to unadvanced commitments on impaired loans | 350,000 |  | 350,000 |  | 350,000
Non-Covered Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Post-Modification Outstanding Recorded Balance | $ 187,000 | $ 0 | $ 187,000 | $ 676,000 |
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 0 | 1 | 1 |
Restructuring Reserve | $ 820,000 |  | $ 820,000 |  | 719,000
Financing Receivable, Gross | 4,219,689,000 |  | 4,219,689,000 |  | 4,024,221,000
Non-Covered Loans | Consumer and other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Restructuring Reserve | 0 |  | 0 |  | 0
Financing Receivable, Gross | $ 136,025,000 |  | $ 136,025,000 |  | $ 137,234,000

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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=84173941&loc=SL6953676-111524 + Details
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