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Stock Options and Stock-Based Compensation (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 1995 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares of common stock reserved for issuance (in shares) |  |  |  |  |  | 400,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Vesting Term (In Years) |  |  | 10 years |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 1,178,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  |  |  |  |
Compensation cost recognized for options granted | 431,000 us-gaap_AllocatedShareBasedCompensationExpense | 214,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Unrecognized compensation costs | 412,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 433,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |
Granted in 1995 (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |
Percentage of options vesting two years (in hundredths) |  |  | 50.00%fnlc_PercentageOfOptionsVestingTwoYears |  |  |
Vesting term, option one (in years) |  |  | 2 years |  |  |
Percentage of options vesting five years (in hundredths) |  |  | 50.00%fnlc_PercentageOfOptionsVestingFiveYears |  |  |
Vesting term, option two (in years) |  |  | 5 years |  |  |
Summary of status and changes of Stock Option Plan [Roll Forward] |  |  |  |  |  |
Outstanding, beginning of period (in shares) | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |
Granted(in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |
Exercised (in shares) | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |
Forfeited (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod |  |  |  |  |
Outstanding, end of period (in shares) | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |
Exercisable, end of period (in shares) | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Outstanding options, weighted average exercise price, beginning of period (in dollars per share) | $ 18.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |  |
Granted options, weighted average exercise price (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |  |  |  |
Exercised options, weighted average exercise price (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |  |  |  |
Forfeited options, weighted average exercise price (in dollars per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |  |  |  |  |
Outstanding options, weighted average exercise price, end of period (in dollars per share) | $ 18.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 18.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |
Exercisable options, weighted average exercise price, end of period (in dollars per share) | $ 18.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |  |  |
Outstanding options, end of period, weighted average remaining contractual term (in years) | 1 month |  |  |  |  |
Exercisable options, end of period, weighted average remaining contractual term (in years) | 1 month |  |  |  |  |
Exercised options, aggregate intrinsic value | 0 fnlc_ExercisedOptionsAggregateIntrinsicValue |  |  |  |  |
Outstanding options, end of period, aggregate intrinsic value | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |  |  |  |
Exercisable options, end of period, aggregate intrinsic value | $ 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) | 72,684 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |
2011 Plan | One Year | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 1 year |  |  |  |  |
2011 Plan | Two Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 2 years | 2 years |  |  |  |
2011 Plan | Four Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) |  |  |  | 4 years | 4 years |
Restricted stock granted (in shares) |  | 3,808 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FourYearsMember |  | 2,704 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FourYearsMember | 1,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FourYearsMember |
Remaining Term (In Years) |  | 1 year 1 month 6 days |  | 1 year 2 months 12 days | 1 month |
2011 Plan | Restricted Stock | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) | 72,684 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = us-gaap_RestrictedStockMember |  |  |  |  |
Remaining Term (In Years) | 1 year 10 months 24 days |  |  |  |  |
2011 Plan | Five Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 5 years | 5 years |  | 5 years | 5 years |
Restricted stock granted (in shares) |  | 14,776 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FiveYearsMember |  | 7,996 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FiveYearsMember | 5,500 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_FiveYearsMember |
Remaining Term (In Years) |  | 3 years 1 month 6 days |  | 2 years 2 months 12 days | 1 year 1 month 6 days |
2011 Plan | Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) |  | 8,530 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_YearsMember |  | 2,027 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan2011Member / fnlc_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardAwardTypeAxis = us-gaap_RestrictedStockMember / fnlc_VestingTermAxis = fnlc_YearsMember |  |
Remaining Term (In Years) |  | 1 month |  | 2 months |  |
2011 Plan | Three Years [Member] | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) |  | 3 years |  | 3 years |  |
1995 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted in 1995 (in shares) |  |  | 600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan1995Member |  |  |
Summary of status and changes of Stock Option Plan [Roll Forward] |  |  |  |  |  |
Granted(in shares) |  |  | 600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = fnlc_Plan1995Member |  |  |
Plan 2010 | One Year | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) | 5,086 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = fnlc_Plan2010Member / us-gaap_VestingAxis = fnlc_OneYearMember |  |  |  |  |
Remaining Term (In Years) | 1 month |  |  |  |  |
Plan 2010 | Two Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) | 10,335 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = fnlc_Plan2010Member / us-gaap_VestingAxis = fnlc_TwoYearsMember |  |  |  |  |
Remaining Term (In Years) | 1 year |  |  |  |  |
Plan 2010 | Five Years | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted stock granted (in shares) | 10,422 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = fnlc_Plan2010Member / us-gaap_VestingAxis = fnlc_FiveYearsMember |  |  |  |  |
Remaining Term (In Years) | 4 years |  |  |  |  |

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- Definition Description of the remaining period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition Description of the period of time over which an employee's right to exercise the final tranche of options awarded is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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