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Loans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($)
Schedule of Financing Receivables [Line Items] |  |  |
Net deferred loan costs included in loan balances | $ 5,748 | $ 4,921 |
Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston | 239,805 | 257,122 |
Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | 290,247 | 261,463 |
Nonaccrual loans | 14,736 | 7,774 |
Interest income which would have been recognized on these loans, if interest had been accrued | 496 | 288 | $ 369
90 Plus Days And Accruing | 445 | 777 |
Loans to directors, officers and employees | $ 34,715 | $ 34,889 |
Number of loans | loan | 62 | 71 |
TDR recorded investment | $ 17,801 | $ 21,526 |
Number of loans | loan | 12 | 12 |
TDR recorded investment more than 30 days past due | $ 1,407 | $ 2,303 |
Number of loans placed on TDR status in previous 12 months | loan | 0 | 0 |
Number of loans | loan | 0 |  |
Loans classified as TDRs that are involved in bankruptcy | $ 688 |  |
Number of loans classified as TDRs that were on non-accrual status | loan | 9 |  |
Loans classified as TDRs that were on non-accrual status | $ 1,145 |  |
Number of loans classified as TDRs that are involved in foreclosure | loan | 3 |  |
Loans classified as TDRs that are involved in foreclosure | $ 458 |  |
Number of mortgage loans in the process of foreclosure | loan | 12 | 15 |
Mortgage loans in the process of foreclosure | $ 1,777 | $ 2,058 |
Loans Receivable in Bankruptcy |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Number of loans | loan | 4 |  |

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 + Details
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- Definition Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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