| **Loans - Narrative (Details) $ in Thousands**                                                                                   | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Schedule of Financing Receivables [Line Items]**                                                                               |            |   |   |
| Net deferred loan costs included in loan balances                                                                                | $ 4,921         | $ 3,686 |   |
| Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston                                                 | 257,122         | 279,463 |   |
| Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | 261,463         | 243,578 |   |
| Nonaccrual loans                                                                                                                 | 7,774           | 7,372 |   |
| Interest income which would have been recognized on these loans, if interest had been accrued                                    | 288             | 369 | $ 551 |
| 90 Plus Days And Accruing                                                                                                        | 777             | 136 |   |
| Loans to directors, officers and employees                                                                                       | $ 34,889        | $ 31,285 |   |
| Number of loans | loan                                                                                                           | 71              | 84 |   |
| TDR recorded investment                                                                                                          | $ 21,526        | $ 23,923 |   |
| Number of loans | loan                                                                                                           | 12              | 8 |   |
| TDR recorded investment more than 30 days past due                                                                               | $ 2,303         | $ 1,053 |   |
| Number of loans placed on TDR status in previous 12 months | loan                                                                | 0               | 0 |   |
| Number of loans | loan                                                                                                           | 0               | 2 |   |
| Pre-modification recorded investment                                                                                             |            | $ 218 |   |
| Loans classified as TDRs that are involved in bankruptcy                                                                         | $ 1,693         |   |   |
| Number of loans classified as TDRs that were on non-accrual status | loan                                                        | 9               |   |   |
| Loans classified as TDRs that were on non-accrual status                                                                         | $ 1,715         |   |   |
| Number of loans classified as TDRs that are involved in foreclosure | loan                                                       | 1               |   |   |
| Loans classified as TDRs that are involved in foreclosure                                                                        | $ 46            |   |   |
| Number of mortgage loans in the process of foreclosure | loan                                                                    | 15              | 16 |   |
| Mortgage loans in the process of foreclosure                                                                                     | $ 2,058         | $ 1,513 |   |
| Loans Receivable in Bankruptcy                                                                                                   |            |   |   |
| **Schedule of Financing Receivables [Line Items]**                                                                               |            |   |   |
| Number of loans | loan                                                                                                           | 6               |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.
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No definition available.
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Carrying amount of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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The number of financing receivables that have been modified by troubled debt restructurings during the current period.
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The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings before the financing receivable has been modified during the current period.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure
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| X                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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The number of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date.
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| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Financing receivables that are greater than 30 days past due.
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| X                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loans classified as troubled debt restructurings that are involved in foreclosure as of the balance sheet date.
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| X                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Mortgage Loans in Process of Foreclosure, Number
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| X                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
-- None. No documentation exists for this element. --
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the collateral pledged in support of federal home loan bank advances outstanding.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
Number of financing receivables that have been modified by troubled debt restructurings.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.
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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
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| - Definition
Recorded investment in financing receivables that are 90 days or more past due and still accruing.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.
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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
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).
+ References
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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.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.
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