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Loans, Allowance for Loan Losses and Credit Quality (Textual) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 USD ($) contract | Dec. 31, 2016 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment | $ 0 |  |  |  |
Unamortized Loan Commitment and Origination fees | 5,600,000 |  | $ 5,600,000 |  | $ 5,100,000
Significant Advanced Considered For Risk Rating Change |  |  | $ 50,000 |  |
Days to be termed as non accrual loans |  |  | 90 days |  |
Tdrs Recorded Investment On Nonaccrual Status | 5,776,000 |  | $ 5,776,000 |  | 5,199,000
Unamortized Discounts or Premiums | $ 9,800,000 |  | $ 9,800,000 |  | $ 8,600,000
Residential Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract |  |  | 1 |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | $ 205,000 |  |
Consumer Home Equity [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract |  | 1 |  | 1 |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 141,000 |  | $ 141,000 |

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- Definition Troubled Debt Restructurings recorded investment that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
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- Definition Premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. + References No definition available. + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees + References No definition available. + 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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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, 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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