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Loans - Narrative (Details) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) loan
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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 | $ 2,000,000.0 |
Restructuring Reserve | 7,900,000 |
Unadvanced Commitment on Impaired Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Estimated losses attributable to unadvanced commitments on impaired loans | 400,000 | 350,000
Non-Covered Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Restructuring Reserve | 633,000 | 719,000
Financing Receivable, Gross | 4,216,081,000 | 4,024,221,000
Non-Covered Loans | Consumer and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Restructuring Reserve | 0 | 0
Financing Receivable, Gross | $ 147,304,000 | $ 137,234,000

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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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