| **Loans (Details) (USD $)**                                                                                                      | 3 Months Ended | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | $ 870,892,000  | $ 894,684,000   | $ 864,988,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 100.00%        | 100.00%         | 100.00% |
| Net deferred loan costs included in loan balances                                                                                | 1,520,000      | 1,366,000       | 1,386,000 |
| Loans used to collateralize borrowings from the Federal Home Loan Bank of Boston                                                 | 229,448,000    | 201,069,000     | 211,597,000 |
| Commercial, construction and home equity loans used to collateralize unused line of credit at the Federal Reserve Bank of Boston | 227,022,000    | 346,424,000     | 218,417,000 |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 8,227,000      | 8,070,000       | 8,619,000 |
| 90 Plus Days Past Due                                                                                                            | 18,347,000     | 18,743,000      | 17,978,000 |
| All Past Due                                                                                                                     | 26,574,000     | 26,813,000      | 26,597,000 |
| Current                                                                                                                          | 844,318,000    | 867,871,000     | 838,391,000 |
| Total                                                                                                                            | 870,892,000    | 894,684,000     | 864,988,000 |
| 90 Plus Days And Accruing                                                                                                        | 1,955,000      | 291,000         |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 24,438,000     | 22,498,000      | 27,806,000 |
| Recorded Investment                                                                                                              | 26,701,000     | 18,191,000      | 27,897,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 26,701,000     | 18,191,000      | 27,897,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 25,916,000     | 17,599,000      | 19,341,000 |
| Recognized Interest Income                                                                                                       | 91,000         | 63,000          | 248,000 |
| Balance of impaired loans                                                                                                        | 26,701,000     | 18,191,000      | 27,897,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Commercial Real Estate [Member]                                                                                                  |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 254,708,000    | 263,800,000     | 255,424,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 2.93%          | 29.50%          | 29.50% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 623,000        | 682,000         | 2,872,000 |
| 90 Plus Days Past Due                                                                                                            | 4,526,000      | 6,431,000       | 3,992,000 |
| All Past Due                                                                                                                     | 5,149,000      | 7,113,000       | 6,864,000 |
| Current                                                                                                                          | 249,559,000    | 256,687,000     | 248,560,000 |
| Total                                                                                                                            | 254,708,000    | 263,800,000     | 255,424,000 |
| 90 Plus Days And Accruing                                                                                                        | 1,025,000      | 270,000         | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 7,160,000      | 7,482,000       | 7,064,000 |
| Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]                                                    |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 10,704,000     | 5,354,000       | 5,584,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 10,704,000     | 5,354,000       | 5,584,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 8,445,000      | 4,557,000       | 5,212,000 |
| Recognized Interest Income                                                                                                       | 40,000         | 6,000           | 23,000 |
| Balance of impaired loans                                                                                                        | 10,704,000     | 5,354,000       | 5,584,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Commercial Real Estate [Member] | With an Allowance Recorded [Member]                                                            |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 3,591,000      | 2,128,000       | 4,557,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 3,591,000      | 2,128,000       | 4,557,000 |
| Allowance for loan losses                                                                                                        | 944,000        | 593,000         | 808,000 |
| Average Recorded Investment                                                                                                      | 4,278,000      | 2,260,000       | 2,307,000 |
| Recognized Interest Income                                                                                                       | 10,000         | 26,000          | 103,000 |
| Balance of impaired loans                                                                                                        | 3,591,000      | 2,128,000       | 4,557,000 |
| Allowance for loan losses                                                                                                        | 944,000        | 593,000         | 808,000 |
| Commercial Construction [Member]                                                                                                 |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 30,828,000     | 29,316,000      | 32,574,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 3.50%          | 3.30%           | 3.80% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 1,951,000      | 65,000          | 174,000 |
| 90 Plus Days Past Due                                                                                                            | 35,000         | 256,000         | 1,603,000 |
| All Past Due                                                                                                                     | 1,986,000      | 321,000         | 1,777,000 |
| Current                                                                                                                          | 28,842,000     | 28,995,000      | 30,797,000 |
| Total                                                                                                                            | 30,828,000     | 29,316,000      | 32,574,000 |
| 90 Plus Days And Accruing                                                                                                        | 0              | 0               | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 946,000        | 813,000         | 2,350,000 |
| Commercial Construction [Member] | With No Related Allowance Recorded [Member]                                                   |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 1,362,000      | 813,000         | 5,172,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 1,362,000      | 813,000         | 5,172,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 2,983,000      | 442,000         | 1,071,000 |
| Recognized Interest Income                                                                                                       | 13,000         | 36,000          | 143,000 |
| Balance of impaired loans                                                                                                        | 1,362,000      | 813,000         | 5,172,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Commercial Construction [Member] | With an Allowance Recorded [Member]                                                           |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 731,000        | 0               | 530,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 731,000        | 0               | 530,000 |
| Allowance for loan losses                                                                                                        | 117,000        | 0               | 33,000 |
| Average Recorded Investment                                                                                                      | 597,000        | 453,000         | 247,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 731,000        | 0               | 530,000 |
| Allowance for loan losses                                                                                                        | 117,000        | 0               | 33,000 |
| Commercial Other [Member]                                                                                                        |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 85,467,000     | 101,762,000     | 86,982,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 9.80%          | 11.40%          | 10.10% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 1,578,000      | 858,000         | 1,431,000 |
| 90 Plus Days Past Due                                                                                                            | 1,869,000      | 563,000         | 1,192,000 |
| All Past Due                                                                                                                     | 3,447,000      | 1,421,000       | 2,623,000 |
| Current                                                                                                                          | 82,020,000     | 100,341,000     | 84,359,000 |
| Total                                                                                                                            | 85,467,000     | 101,762,000     | 86,982,000 |
| 90 Plus Days And Accruing                                                                                                        | 563,000        | 2,000           | 52,000 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 2,634,000      | 1,615,000       | 5,784,000 |
| Commercial Other [Member] | With No Related Allowance Recorded [Member]                                                          |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 2,811,000      | 1,033,000       | 6,022,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 2,811,000      | 1,033,000       | 6,022,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 2,981,000      | 1,173,000       | 1,919,000 |
| Recognized Interest Income                                                                                                       | 8,000          | 7,000           | 28,000 |
| Balance of impaired loans                                                                                                        | 2,811,000      | 1,033,000       | 6,022,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Commercial Other [Member] | With an Allowance Recorded [Member]                                                                  |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 1,075,000      | 571,000         | 1,020,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 1,075,000      | 571,000         | 1,020,000 |
| Allowance for loan losses                                                                                                        | 480,000        | 326,000         | 402,000 |
| Average Recorded Investment                                                                                                      | 2,223,000      | 549,000         | 681,000 |
| Recognized Interest Income                                                                                                       | 5,000          | 5,000           | 19,000 |
| Balance of impaired loans                                                                                                        | 1,075,000      | 571,000         | 1,020,000 |
| Allowance for loan losses                                                                                                        | 480,000        | 326,000         | 402,000 |
| Municipal [Member]                                                                                                               |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 15,961,000     | 20,834,000      | 16,221,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 1.80%          | 2.30%           | 1.90% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 0              | 0               | 0 |
| 90 Plus Days Past Due                                                                                                            | 0              | 0               | 0 |
| All Past Due                                                                                                                     | 0              | 0               | 0 |
| Current                                                                                                                          | 15,961,000     | 20,834,000      | 16,221,000 |
| Total                                                                                                                            | 15,961,000     | 20,834,000      | 16,221,000 |
| 90 Plus Days And Accruing                                                                                                        | 0              | 0               | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 0              | 0               | 0 |
| Municipal [Member] | With No Related Allowance Recorded [Member]                                                                 |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 0              | 0               | 0 |
| Unpaid Principal, Impaired Loans                                                                                                 | 0              | 0               | 0 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 0              | 0               | 0 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 0              | 0               | 0 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Municipal [Member] | With an Allowance Recorded [Member]                                                                         |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 0              | 0               | 0 |
| Unpaid Principal, Impaired Loans                                                                                                 | 0              | 0               | 0 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 0              | 0               | 0 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 0              | 0               | 0 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Residential Term [Member]                                                                                                        |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 358,394,000    | 340,841,000     | 341,286,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 4.12%          | 38.10%          | 39.50% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 3,324,000      | 5,456,000       | 3,331,000 |
| 90 Plus Days Past Due                                                                                                            | 9,299,000      | 8,623,000       | 8,843,000 |
| All Past Due                                                                                                                     | 12,623,000     | 14,079,000      | 12,174,000 |
| Current                                                                                                                          | 345,771,000    | 326,762,000     | 329,112,000 |
| Total                                                                                                                            | 358,394,000    | 340,841,000     | 341,286,000 |
| 90 Plus Days And Accruing                                                                                                        | 359,000        | 0               | 1,118,000 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 10,893,000     | 9,632,000       | 10,194,000 |
| Residential Term [Member] | With No Related Allowance Recorded [Member]                                                          |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 9,930,000      | 8,907,000       | 9,875,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 9,930,000      | 8,907,000       | 9,875,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 10,001,000     | 8,120,000       | 9,493,000 |
| Recognized Interest Income                                                                                                       | 30,000         | 14,000          | 54,000 |
| Balance of impaired loans                                                                                                        | 9,930,000      | 8,907,000       | 9,875,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Residential Term [Member] | With an Allowance Recorded [Member]                                                                  |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 8,124,000      | 5,041,000       | 6,946,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 8,124,000      | 5,041,000       | 6,946,000 |
| Allowance for loan losses                                                                                                        | 592,000        | 381,000         | 478,000 |
| Average Recorded Investment                                                                                                      | 7,449,000      | 5,533,000       | 5,628,000 |
| Recognized Interest Income                                                                                                       | 59,000         | 57,000          | 228,000 |
| Balance of impaired loans                                                                                                        | 8,124,000      | 5,041,000       | 6,946,000 |
| Allowance for loan losses                                                                                                        | 592,000        | 381,000         | 478,000 |
| Residential Construction [Member]                                                                                                |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 6,451,000      | 13,370,000      | 10,469,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 0.70%          | 1.50%           | 1.20% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 492,000        | 0               | 0 |
| 90 Plus Days Past Due                                                                                                            | 1,454,000      | 2,247,000       | 1,198,000 |
| All Past Due                                                                                                                     | 1,946,000      | 2,247,000       | 1,198,000 |
| Current                                                                                                                          | 4,505,000      | 11,123,000      | 9,271,000 |
| Total                                                                                                                            | 6,451,000      | 13,370,000      | 10,469,000 |
| 90 Plus Days And Accruing                                                                                                        | 0              | 0               | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 1,454,000      | 2,247,000       | 1,198,000 |
| Residential Construction [Member] | With No Related Allowance Recorded [Member]                                                  |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 1,120,000      | 1,672,000       | 468,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 1,120,000      | 1,672,000       | 468,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 718,000        | 2,948,000       | 961,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 1,120,000      | 1,672,000       | 468,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Residential Construction [Member] | With an Allowance Recorded [Member]                                                          |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 334,000        | 576,000         | 730,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 334,000        | 576,000         | 730,000 |
| Allowance for loan losses                                                                                                        | 49,000         | 106,000         | 235,000 |
| Average Recorded Investment                                                                                                      | 598,000        | 192,000         | 244,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 334,000        | 576,000         | 730,000 |
| Allowance for loan losses                                                                                                        | 49,000         | 106,000         | 235,000 |
| Home equity line of credit [Member]                                                                                              |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 103,372,000    | 106,172,000     | 105,244,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 11.90%         | 11.80%          | 12.10% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 86,000         | 759,000         | 480,000 |
| 90 Plus Days Past Due                                                                                                            | 1,156,000      | 604,000         | 1,134,000 |
| All Past Due                                                                                                                     | 1,242,000      | 1,363,000       | 1,614,000 |
| Current                                                                                                                          | 102,130,000    | 104,809,000     | 103,630,000 |
| Total                                                                                                                            | 103,372,000    | 106,172,000     | 105,244,000 |
| 90 Plus Days And Accruing                                                                                                        | 0              | 0               | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 1,336,000      | 604,000         | 1,163,000 |
| Home equity line of credit [Member] | With No Related Allowance Recorded [Member]                                                |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 774,000        | 373,000         | 739,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 774,000        | 373,000         | 739,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 776,000        | 317,000         | 646,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 774,000        | 373,000         | 739,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Home equity line of credit [Member] | With an Allowance Recorded [Member]                                                        |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 562,000        | 231,000         | 424,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 562,000        | 231,000         | 424,000 |
| Allowance for loan losses                                                                                                        | 156,000        | 139,000         | 91,000 |
| Average Recorded Investment                                                                                                      | 519,000        | 231,000         | 272,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 562,000        | 231,000         | 424,000 |
| Allowance for loan losses                                                                                                        | 156,000        | 139,000         | 91,000 |
| Consumer [Member]                                                                                                                |           |            |   |
| **Composition of Loan Portfolio [Abstract]**                                                                                     |           |            |   |
| Amount of loan portfolio                                                                                                         | 15,711,000     | 18,589,000      | 16,788,000 |
| Percentage of loan portfolio (in hundredths)                                                                                     | 1.80%          | 2.10%           | 1.90% |
| **Loans, aging disclosure [Abstract]**                                                                                           |           |            |   |
| 30-89 Days Past Due                                                                                                              | 173,000        | 250,000         | 331,000 |
| 90 Plus Days Past Due                                                                                                            | 8,000          | 19,000          | 16,000 |
| All Past Due                                                                                                                     | 181,000        | 269,000         | 347,000 |
| Current                                                                                                                          | 15,530,000     | 18,320,000      | 16,441,000 |
| Total                                                                                                                            | 15,711,000     | 18,589,000      | 16,788,000 |
| 90 Plus Days And Accruing                                                                                                        | 8,000          | 19,000          | 0 |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Nonaccrual Loans Receivable                                                                                                      | 15,000         | 105,000         | 53,000 |
| Consumer [Member] | With No Related Allowance Recorded [Member]                                                                  |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 0              | 39,000          | 37,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 0              | 39,000          | 37,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Average Recorded Investment                                                                                                      | 12,000         | 42,000          | 39,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 0              | 39,000          | 37,000 |
| Allowance for loan losses                                                                                                        | 0              | 0               | 0 |
| Consumer [Member] | With an Allowance Recorded [Member]                                                                          |           |            |   |
| **Nonaccrual Loans [Abstract]**                                                                                                  |           |            |   |
| Recorded Investment                                                                                                              | 15,000         | 76,000          | 16,000 |
| Unpaid Principal, Impaired Loans                                                                                                 | 15,000         | 76,000          | 16,000 |
| Allowance for loan losses                                                                                                        | 10,000         | 76,000          | 11,000 |
| Average Recorded Investment                                                                                                      | 15,000         | 73,000          | 57,000 |
| Recognized Interest Income                                                                                                       | 0              | 0               | 0 |
| Balance of impaired loans                                                                                                        | 15,000         | 76,000          | 16,000 |
| Allowance for loan losses                                                                                                        | $ 10,000       | $ 76,000        | $ 11,000 |

| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**fnlc_CompositionOfLoanPortfolioAbstract**Namespace Prefix:**fnlc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are less than 90 days past due but more than 29 days past due.
+ References
No definition available.
+ Details**Name:**fnlc_LoansReceivable3089DaysPastDue**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio.
+ References
No definition available.
+ Details**Name:**fnlc_PercentageOfLoansReceivableByType**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
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| - Definition
States the amount of the collateral pledged in support of Federal Home Loan Bank advances outstanding as of the Balance Sheet date.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded investment in financing receivables that are 90 days or more past due and still accruing.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are current.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are equal to or greater than 90 days past due.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Recorded Investment in financing receivables that are past due at the balance sheet date.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average recorded investment related to impaired financing receivables.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The interest income recognized during the time within that period that the financing receivables were impaired.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The recorded investment related to impaired financing receivables.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of allowance for credit losses related to recorded investment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The unpaid principal balance related to impaired financing receivables.
+ References
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| X                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| - Definition
Reflects the cumulative amount of interest and fees paid by borrowers which have not yet been taken into income in conformity with GAAP. Also reflects the amount of 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 that are being amortized into income as an adjustment to yield.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.
+ 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.
+ References
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