| **Allowance for Loan Losses (Details) (USD $)**                                                                     | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | $ 12,954,000   | $ 14,000,000    | $ 13,000,000 |
| Residential loans typical loan-to-value range, low (in hundredths)                                                  | 75.00%         |            |   |
| Residential loans typical loan-to-value maximum (in hundredths)                                                     | 80.00%         |            |   |
| Collateralized consumer loans to individuals loan-to-value maximum range, low (in hundredths)                       | 80.00%         |            |   |
| Collateralized consumer loans to individuals loan-to-value maximum range, high (in hundredths)                      | 90.00%         |            |   |
| Delinquent period before residential loans placed on non-accrual status (in days)                                   | 90             |            |   |
| Delinquent period before consumer loans charged off (in days)                                                       | 120            |            |   |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 13,000,000     |            |   |
| Charge offs                                                                                                         | 2,470,000      | 1,513,000       | 11,179,000 |
| Recoveries                                                                                                          | 324,000        | 97,000          | 313,000 |
| Provision                                                                                                           | 2,100,000      | 2,100,000       | 10,550,000 |
| Ending balance                                                                                                      | 12,954,000     | 14,000,000      | 13,000,000 |
| Ending balance specifically evaluated for impairment                                                                | 2,348,000      | 1,621,000       | 2,058,000 |
| Ending balance collectively evaluated for impairment                                                                | 10,606,000     | 12,379,000      | 10,942,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 870,892,000    | 894,684,000     | 864,988,000 |
| Ending balance specifically evaluated for impairment                                                                | 41,133,000     | 26,814,000      |   |
| Ending balance collectively evaluated for impairment                                                                | 829,759,000    | 867,870,000     |   |
| Number of loans                                                                                                     | 71             | 36              | 59 |
| Balance                                                                                                             | 20,647,000     | 6,021,000       | 22,858,000 |
| Specific reserves                                                                                                   | 606,000        |            |   |
| Number of loans                                                                                                     | 14             |            |   |
| Pre-modification outstanding recorded investment                                                                    | 3,007,000      |            |   |
| Post-modification outstanding recorded investment                                                                   | 2,973,000      |            |   |
| Specific reserves                                                                                                   | 73,000         |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 11             |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 2,258,000      |            |   |
| Number of loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months | 7              |            |   |
| Loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months           | 1,733,000      |            |   |
| Loans classified as troubled debt restructurings that are involved in bankruptcy                                    | 1,021,000      |            |   |
| Loans classified as troubled debt restructurings and that were on non-accrual status                                | 3,160,000      |            |   |
| **Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]**                              |           |            |   |
| Commercial real estate loans maximum loan-to-value (in hundredths)                                                  | 75.00%         |            |   |
| Construction loans actual loan portfolio-to-Company capital (in hundredths)                                         | 35.00%         |            |   |
| Construction loans maximum loan portfolio-to-Company capital (in hundredths)                                        | 100.00%        |            |   |
| Construction and non-owner-occupied commercial real estate loan portfolio-to-Company Capital (in hundredths)        | 99.00%         |            |   |
| Construction and non-owner-occupied commercial real estate loan portfolio loan-to-Company capital (in hundredths)   | 300.00%        |            |   |
| Commercial Real Estate [Member]                                                                                     |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 5,659,000      | 5,260,000       | 5,260,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 5,260,000      |            |   |
| Charge offs                                                                                                         | 0              | 289,000         | 1,619,000 |
| Recoveries                                                                                                          | 0              | 5,000           | 23,000 |
| Provision                                                                                                           | 203,000        | 1,334,000       | 1,995,000 |
| Ending balance                                                                                                      | 5,659,000      | 5,260,000       | 5,260,000 |
| Ending balance specifically evaluated for impairment                                                                | 944,000        | 593,000         | 808,000 |
| Ending balance collectively evaluated for impairment                                                                | 4,918,000      | 5,717,000       | 4,851,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 5,862,000      | 6,310,000       | 5,659,000 |
| Ending balance specifically evaluated for impairment                                                                | 14,295,000     | 7,482,000       | 10,141,000 |
| Ending balance collectively evaluated for impairment                                                                | 240,413,000    | 256,318,000     | 245,283,000 |
| Number of loans                                                                                                     | 12             |            |   |
| Balance                                                                                                             | 7,610,000      |            |   |
| Specific reserves                                                                                                   | 271,000        |            |   |
| Number of loans                                                                                                     | 7              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 2,438,000      |            |   |
| Post-modification outstanding recorded investment                                                                   | 2,404,000      |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Commercial Real Estate [Member] | Strong 1 [Member]                                                                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 23,000         | 30,000          | 23,000 |
| Commercial Real Estate [Member] | Above Average 2 [Member]                                                          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 19,788,000     | 21,270,000      | 21,334,000 |
| Commercial Real Estate [Member] | Satisfactory 3 [Member]                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 32,903,000     | 45,331,000      | 33,119,000 |
| Commercial Real Estate [Member] | Average 4 [Member]                                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 105,446,000    | 120,462,000     | 106,171,000 |
| Commercial Real Estate [Member] | Watch 5 [Member]                                                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 42,680,000     | 26,660,000      | 44,215,000 |
| Commercial Real Estate [Member] | OAEM 6 [Member]                                                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 18,302,000     | 18,797,000      | 18,309,000 |
| Commercial Real Estate [Member] | Substandard 7 [Member]                                                            |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 34,887,000     | 31,250,000      | 31,575,000 |
| Commercial Real Estate [Member] | Doubtful 8 [Member]                                                               |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 679,000        | 0               | 678,000 |
| Commercial Real Estate [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 944,000        | 593,000         | 808,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 944,000        | 593,000         | 808,000 |
| Commercial Real Estate [Member] | General Reserves Based on Historical Loss Experience [Member]                     |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 2,648,000      | 2,536,000       | 2,578,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 2,648,000      | 2,536,000       | 2,578,000 |
| Commercial Real Estate [Member] | Reserve for Qualitative Factors [Member]                                          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 2,270,000      | 3,181,000       | 2,273,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 2,270,000      | 3,181,000       | 2,273,000 |
| Commercial Real Estate [Member] | Unallocated Reserves [Member]                                                     |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Commercial Construction [Member]                                                                                    |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 658,000        | 1,012,000       | 1,012,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 1,012,000      |            |   |
| Charge offs                                                                                                         | 0              | 0               | 346,000 |
| Recoveries                                                                                                          | 246,000        | 0               | 0 |
| Provision                                                                                                           | (200,000)      | (373,000)       | (8,000) |
| Ending balance                                                                                                      | 658,000        | 1,012,000       | 1,012,000 |
| Ending balance specifically evaluated for impairment                                                                | 117,000        | 0               | 33,000 |
| Ending balance collectively evaluated for impairment                                                                | 587,000        | 639,000         | 625,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 704,000        | 639,000         | 658,000 |
| Ending balance specifically evaluated for impairment                                                                | 2,093,000      | 813,000         | 5,702,000 |
| Ending balance collectively evaluated for impairment                                                                | 28,735,000     | 28,503,000      | 26,872,000 |
| Number of loans                                                                                                     | 1              |            |   |
| Balance                                                                                                             | 1,148,000      |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Commercial Construction [Member] | Strong 1 [Member]                                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 0 |
| Commercial Construction [Member] | Above Average 2 [Member]                                                         |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 10,000          | 0 |
| Commercial Construction [Member] | Satisfactory 3 [Member]                                                          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 1,396,000      | 10,000          | 1,365,000 |
| Commercial Construction [Member] | Average 4 [Member]                                                               |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 19,130,000     | 14,650,000      | 17,125,000 |
| Commercial Construction [Member] | Watch 5 [Member]                                                                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 3,530,000      | 5,896,000       | 3,287,000 |
| Commercial Construction [Member] | OAEM 6 [Member]                                                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 538,000        | 3,948,000       | 2,320,000 |
| Commercial Construction [Member] | Substandard 7 [Member]                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 6,234,000      | 4,802,000       | 7,323,000 |
| Commercial Construction [Member] | Doubtful 8 [Member]                                                              |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 1,154,000 |
| Commercial Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 117,000        | 0               | 33,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 117,000        | 0               | 33,000 |
| Commercial Construction [Member] | General Reserves Based on Historical Loss Experience [Member]                    |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 316,000        | 284,000         | 332,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 316,000        | 284,000         | 332,000 |
| Commercial Construction [Member] | Reserve for Qualitative Factors [Member]                                         |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 271,000        | 355,000         | 293,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 271,000        | 355,000         | 293,000 |
| Commercial Construction [Member] | Unallocated Reserves [Member]                                                    |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Commercial Other [Member]                                                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 2,063,000      | 2,377,000       | 2,377,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 2,377,000      |            |   |
| Charge offs                                                                                                         | 2,002,000      | 161,000         | 6,492,000 |
| Recoveries                                                                                                          | 2,000          | 17,000          | 60,000 |
| Provision                                                                                                           | 2,062,000      | 302,000         | 6,118,000 |
| Ending balance                                                                                                      | 2,063,000      | 2,377,000       | 2,377,000 |
| Ending balance specifically evaluated for impairment                                                                | 480,000        | 326,000         | 402,000 |
| Ending balance collectively evaluated for impairment                                                                | 1,645,000      | 2,209,000       | 1,661,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 2,125,000      | 2,535,000       | 2,063,000 |
| Ending balance specifically evaluated for impairment                                                                | 3,886,000      | 1,604,000       | 7,042,000 |
| Ending balance collectively evaluated for impairment                                                                | 81,581,000     | 100,158,000     | 79,940,000 |
| Number of loans                                                                                                     | 12             |            |   |
| Balance                                                                                                             | 1,919,000      |            |   |
| Specific reserves                                                                                                   | 85,000         |            |   |
| Number of loans                                                                                                     | 3              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 12,000         |            |   |
| Post-modification outstanding recorded investment                                                                   | 12,000         |            |   |
| Specific reserves                                                                                                   | 44,000         |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 4              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 667,000        |            |   |
| Commercial Other [Member] | Strong 1 [Member]                                                                       |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 486,000        | 462,000         | 465,000 |
| Commercial Other [Member] | Above Average 2 [Member]                                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 4,418,000      | 4,399,000       | 4,229,000 |
| Commercial Other [Member] | Satisfactory 3 [Member]                                                                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 12,183,000     | 17,258,000      | 10,981,000 |
| Commercial Other [Member] | Average 4 [Member]                                                                      |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 31,412,000     | 40,071,000      | 31,600,000 |
| Commercial Other [Member] | Watch 5 [Member]                                                                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 19,473,000     | 12,425,000      | 17,893,000 |
| Commercial Other [Member] | OAEM 6 [Member]                                                                         |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 4,644,000      | 6,700,000       | 5,303,000 |
| Commercial Other [Member] | Substandard 7 [Member]                                                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 12,158,000     | 20,447,000      | 16,362,000 |
| Commercial Other [Member] | Doubtful 8 [Member]                                                                     |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 693,000        | 0               | 149,000 |
| Commercial Other [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 480,000        | 326,000         | 402,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 480,000        | 326,000         | 402,000 |
| Commercial Other [Member] | General Reserves Based on Historical Loss Experience [Member]                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 886,000        | 980,000         | 883,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 886,000        | 980,000         | 883,000 |
| Commercial Other [Member] | Reserve for Qualitative Factors [Member]                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 759,000        | 1,229,000       | 778,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 759,000        | 1,229,000       | 778,000 |
| Commercial Other [Member] | Unallocated Reserves [Member]                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Municipal [Member]                                                                                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 19,000         | 19,000          | 19,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 19,000         |            |   |
| Charge offs                                                                                                         | 0              | 0               | 0 |
| Recoveries                                                                                                          | 0              | 0               | 0 |
| Provision                                                                                                           | 0              | 0               | 0 |
| Ending balance                                                                                                      | 19,000         | 19,000          | 19,000 |
| Ending balance specifically evaluated for impairment                                                                | 0              | 0               | 0 |
| Ending balance collectively evaluated for impairment                                                                | 19,000         | 19,000          | 19,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 19,000         | 19,000          | 19,000 |
| Ending balance specifically evaluated for impairment                                                                | 0              | 0               | 0 |
| Ending balance collectively evaluated for impairment                                                                | 15,961,000     | 20,834,000      | 16,221,000 |
| Number of loans                                                                                                     | 0              |            |   |
| Balance                                                                                                             | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Municipal [Member] | Strong 1 [Member]                                                                              |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 1,911,000      | 2,448,000       | 2,158,000 |
| Municipal [Member] | Above Average 2 [Member]                                                                       |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 7,602,000      | 11,417,000      | 7,509,000 |
| Municipal [Member] | Satisfactory 3 [Member]                                                                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 3,819,000      | 4,023,000       | 3,861,000 |
| Municipal [Member] | Average 4 [Member]                                                                             |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 2,629,000      | 2,946,000       | 2,693,000 |
| Municipal [Member] | Watch 5 [Member]                                                                               |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 0 |
| Municipal [Member] | OAEM 6 [Member]                                                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 0 |
| Municipal [Member] | Substandard 7 [Member]                                                                         |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 0 |
| Municipal [Member] | Doubtful 8 [Member]                                                                            |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Commercial and municipal risk-rated loans receivable                                                                | 0              | 0               | 0 |
| Municipal [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                               |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Municipal [Member] | General Reserves Based on Historical Loss Experience [Member]                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Municipal [Member] | Reserve for Qualitative Factors [Member]                                                       |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 19,000         | 19,000          | 19,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 19,000         | 19,000          | 19,000 |
| Municipal [Member] | Unallocated Reserves [Member]                                                                  |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Residential Term [Member]                                                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 1,159,000      | 1,408,000       | 1,408,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 1,408,000      |            |   |
| Charge offs                                                                                                         | 239,000        | 457,000         | 1,421,000 |
| Recoveries                                                                                                          | 1,000          | 3,000           | 7,000 |
| Provision                                                                                                           | 315,000        | 451,000         | 1,165,000 |
| Ending balance                                                                                                      | 1,159,000      | 1,408,000       | 1,408,000 |
| Ending balance specifically evaluated for impairment                                                                | 592,000        | 381,000         | 478,000 |
| Ending balance collectively evaluated for impairment                                                                | 644,000        | 1,024,000       | 681,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 1,236,000      | 1,405,000       | 1,159,000 |
| Ending balance specifically evaluated for impairment                                                                | 18,054,000     | 13,948,000      | 16,821,000 |
| Ending balance collectively evaluated for impairment                                                                | 340,340,000    | 326,893,000     | 324,465,000 |
| Number of loans                                                                                                     | 46             |            |   |
| Balance                                                                                                             | 9,970,000      |            |   |
| Specific reserves                                                                                                   | 250,000        |            |   |
| Number of loans                                                                                                     | 4              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 557,000        |            |   |
| Post-modification outstanding recorded investment                                                                   | 557,000        |            |   |
| Specific reserves                                                                                                   | 29,000         |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 7              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 1,591,000      |            |   |
| Residential Term [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 592,000        | 381,000         | 478,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 592,000        | 381,000         | 478,000 |
| Residential Term [Member] | General Reserves Based on Historical Loss Experience [Member]                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 185,000        | 457,000         | 222,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 185,000        | 457,000         | 222,000 |
| Residential Term [Member] | Reserve for Qualitative Factors [Member]                                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 459,000        | 567,000         | 459,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 459,000        | 567,000         | 459,000 |
| Residential Term [Member] | Unallocated Reserves [Member]                                                           |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Residential Construction [Member]                                                                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 255,000        | 44,000          | 44,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 44,000         |            |   |
| Charge offs                                                                                                         | 0              | 505,000         | 505,000 |
| Recoveries                                                                                                          | 0              | 0               | 0 |
| Provision                                                                                                           | (196,000)      | 607,000         | 716,000 |
| Ending balance                                                                                                      | 255,000        | 44,000          | 44,000 |
| Ending balance specifically evaluated for impairment                                                                | 49,000         | 106,000         | 235,000 |
| Ending balance collectively evaluated for impairment                                                                | 10,000         | 40,000          | 20,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 59,000         | 146,000         | 255,000 |
| Ending balance specifically evaluated for impairment                                                                | 1,454,000      | 2,248,000       | 1,198,000 |
| Ending balance collectively evaluated for impairment                                                                | 4,997,000      | 11,122,000      | 9,271,000 |
| Number of loans                                                                                                     | 0              |            |   |
| Balance                                                                                                             | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Residential Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 49,000         | 106,000         | 235,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 49,000         | 106,000         | 235,000 |
| Residential Construction [Member] | General Reserves Based on Historical Loss Experience [Member]                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 2,000          | 18,000          | 6,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 2,000          | 18,000          | 6,000 |
| Residential Construction [Member] | Reserve for Qualitative Factors [Member]                                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 8,000          | 22,000          | 14,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 8,000          | 22,000          | 14,000 |
| Residential Construction [Member] | Unallocated Reserves [Member]                                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Consumer [Member]                                                                                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 584,000        | 646,000         | 646,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 646,000        |            |   |
| Charge offs                                                                                                         | 180,000        |            | 381,000 |
| Recoveries                                                                                                          | 75,000         | 0               | 222,000 |
| Provision                                                                                                           | 89,000         | 0               | 97,000 |
| Ending balance                                                                                                      | 584,000        | 646,000         | 646,000 |
| Ending balance specifically evaluated for impairment                                                                | 10,000         | 76,000          | 11,000 |
| Ending balance collectively evaluated for impairment                                                                | 558,000        | 637,000         | 573,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 568,000        | 713,000         | 584,000 |
| Ending balance specifically evaluated for impairment                                                                | 15,000         | 115,000         | 53,000 |
| Ending balance collectively evaluated for impairment                                                                | 15,696,000     | 18,474,000      | 16,735,000 |
| Number of loans                                                                                                     | 0              |            |   |
| Balance                                                                                                             | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Consumer [Member] | Specific Reserves Evaluated Individually for Impairment [Member]                                |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 10,000         | 76,000          | 11,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 10,000         | 76,000          | 11,000 |
| Consumer [Member] | General Reserves Based on Historical Loss Experience [Member]                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 319,000        | 380,000         | 331,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 319,000        | 380,000         | 331,000 |
| Consumer [Member] | Reserve for Qualitative Factors [Member]                                                        |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 239,000        | 257,000         | 242,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 239,000        | 257,000         | 242,000 |
| Consumer [Member] | Unallocated Reserves [Member]                                                                   |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Unallocated Financing Receivables [Member]                                                                          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 2,008,000      | 1,880,000       | 1,880,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 1,880,000      |            |   |
| Charge offs                                                                                                         | 0              | 0               | 0 |
| Recoveries                                                                                                          | 0              | 0               | 0 |
| Provision                                                                                                           | (309,000)      | (325,000)       | 128,000 |
| Ending balance                                                                                                      | 2,008,000      | 1,880,000       | 1,880,000 |
| Ending balance specifically evaluated for impairment                                                                | 0              | 0               | 0 |
| Ending balance collectively evaluated for impairment                                                                | 1,699,000      | 1,555,000       | 2,008,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 1,699,000      | 1,555,000       | 2,008,000 |
| Ending balance specifically evaluated for impairment                                                                | 0              | 0               | 0 |
| Ending balance collectively evaluated for impairment                                                                | 0              | 0               | 0 |
| Number of loans                                                                                                     | 0              |            |   |
| Balance                                                                                                             | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Unallocated Financing Receivables [Member] | Specific Reserves Evaluated Individually for Impairment [Member]       |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Unallocated Financing Receivables [Member] | General Reserves Based on Historical Loss Experience [Member]          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Unallocated Financing Receivables [Member] | Reserve for Qualitative Factors [Member]                               |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 0              | 0               | 0 |
| Unallocated Financing Receivables [Member] | Unallocated Reserves [Member]                                          |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 1,699,000      | 1,555,000       | 2,008,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 1,699,000      | 1,555,000       | 2,008,000 |
| Home Equity Line Of Credit [Member]                                                                                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 595,000        | 670,000         | 670,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Beginning balance                                                                                                   | 670,000        |            |   |
| Charge offs                                                                                                         | 49,000         | 1,000           | 415,000 |
| Recoveries                                                                                                          | 0              | 0               | 1,000 |
| Provision                                                                                                           | 136,000        | 9,000           | 339,000 |
| Ending balance                                                                                                      | 595,000        | 670,000         | 670,000 |
| Ending balance specifically evaluated for impairment                                                                | 156,000        | 139,000         | 91,000 |
| Ending balance collectively evaluated for impairment                                                                | 526,000        | 539,000         | 504,000 |
| **Related loan balances**                                                                                           |           |            |   |
| Ending balance                                                                                                      | 682,000        | 678,000         | 595,000 |
| Ending balance specifically evaluated for impairment                                                                | 1,336,000      | 604,000         | 1,163,000 |
| Ending balance collectively evaluated for impairment                                                                | 102,036,000    | 105,568,000     | 104,081,000 |
| Number of loans                                                                                                     | 0              |            |   |
| Balance                                                                                                             | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans                                                                                                     | 0              |            |   |
| Pre-modification outstanding recorded investment                                                                    | 0              |            |   |
| Post-modification outstanding recorded investment                                                                   | 0              |            |   |
| Specific reserves                                                                                                   | 0              |            |   |
| Number of loans classified as TDRs, greater than 30 days past due                                                   | 0              |            |   |
| Balance of loans classified as TDRs, greater than 30 days past due                                                  | 0              |            |   |
| Home Equity Line Of Credit [Member] | Specific Reserves Evaluated Individually for Impairment [Member]              |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 156,000        | 139,000         | 91,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 156,000        | 139,000         | 91,000 |
| Home Equity Line Of Credit [Member] | General Reserves Based on Historical Loss Experience [Member]                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 176,000        | 67,000          | 149,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 176,000        | 67,000          | 149,000 |
| Home Equity Line Of Credit [Member] | Reserve for Qualitative Factors [Member]                                      |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 350,000        | 472,000         | 355,000 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | 350,000        | 472,000         | 355,000 |
| Home Equity Line Of Credit [Member] | Unallocated Reserves [Member]                                                 |           |            |   |
| **Financing Receivable, Allowance for Credit Losses [Line Items]**                                                  |           |            |   |
| Allowance for loan losses                                                                                           | 0              | 0               | 0 |
| **Allowance for loan losses**                                                                                       |           |            |   |
| Ending balance                                                                                                      | $ 0            | $ 0             | $ 0 |

| X                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The high maximum percentage of loan to value for consumer loans based on purchase price of the collateral.
+ References
No definition available.
+ Details**Name:**fnlc_CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeHigh**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The low maximum percentage of loan to value for consumer loans based on purchase price of the collateral.
+ References
No definition available.
+ Details**Name:**fnlc_CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeLow**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Loans subject to review and validation annually by independent consulting firm as well internal credit review function.
+ References
No definition available.
+ Details**Name:**fnlc_CommercialAndMunicipalRiskRatedLoansReceivable**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum percentage of loan to value for commercial real estate loans based on current appraisal information.
+ References
No definition available.
+ Details**Name:**fnlc_CommercialRealEstateLoansMaximumLoanToValue**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The regulatory maximum allowed ratio of loan portfolio to Company capital for construction and non-owner-occupied commercial real estate.
+ References
No definition available.
+ Details**Name:**fnlc_ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansMaximumLoanPortfolioToCompanyCaptial**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The actual ratio of loan amount to Company capital for construction and non-owner-occupied commercial real estate.
+ References
No definition available.
+ Details**Name:**fnlc_ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansPortfolioToCompanyCapital**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The regulatory maximum allowed ratio of loan portfolio to Company capital for construction loans.
+ References
No definition available.
+ Details**Name:**fnlc_ConstructionLoanPortfolioMaximumToCompanyCapital**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The ratio of loan portfolio to Company capital for construction loans .
+ References
No definition available.
+ Details**Name:**fnlc_ConstructionLoansActualLoanPortfolioToCompanyCapital**Namespace Prefix:**fnlc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount of days past due at which loans are considered charged off.
+ References
No definition available.
+ Details**Name:**fnlc_DelinquentPeriodBeforeConsumerLoansChargedOff**Namespace Prefix:**fnlc_**Data Type:**us-types:durationStringItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount of days past due at which residential loans are placed on non-accrual status..
+ References
No definition available.
+ Details**Name:**fnlc_DelinquentPeriodBeforeResidentialLoansPlacedOnNonAccrualStatus**Namespace Prefix:**fnlc_**Data Type:**us-types:durationStringItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 montsh.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatHadBeenPlacedOnTdrStatusInPrevious12Months**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatWereOnNonAccrualStatus**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of financing receivables that have been modified by troubled debt restructurings during the current period.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod**Namespace Prefix:**fnlc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDue**Namespace Prefix:**fnlc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings after the financing receivable has been modified during the current period.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
No definition available.
+ Details**Name:**fnlc_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 months.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Financing receivables that are greater than 30 days past due.
+ References
No definition available.
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| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The high percentage of loan to value range for residential loans based on current appraisal information.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The low percentage of loan to value range for residential loans based on current appraisal information.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings during the current period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings during the period.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects a reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were collectively evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The balance of financing receivables that were individually evaluated for impairment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of financing receivables that have been modified by troubled debt restructurings.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953670-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953676-111524Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy.  It will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 4: 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 7 -Subparagraph dReference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544
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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
Reference 1: 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=6965416&loc=d3e5074-111524Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 116 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph e -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy.  It will be removed from future versions of this taxonomy.
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