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Regulatory Capital Requirements (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Tier 1 capital to risk-weighted assets [Abstract]    
Actual $ 128,970,000us-gaap_TierOneRiskBasedCapital $ 121,967,000us-gaap_TierOneRiskBasedCapital
Average assets [Abstract]    
Retained earnings from prior two years available for dividends 12,326,000fnlc_RetainedEarningsFromPriorTwoYearsAvailableForDividends  
Non Consolidated    
Tier 2 capital to risk-weighted asets [Abstract]    
Actual 137,818,000us-gaap_Capital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
131,146,000us-gaap_Capital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose 68,524,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
65,996,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions 85,655,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
82,495,000us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Risk-weighted assets [Abstract]    
Actual (in hundredths) 16.09%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
15.90%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions (in hundredths) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Actual (in hundredths) 14.87%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
14.65%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose (in hundredths) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions (in hundredths) 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Tier 1 capital to risk-weighted assets [Abstract]    
Actual 127,374,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
120,819,000us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose 34,262,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
32,998,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions 51,393,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
49,497,000us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Tier 1 capital to average assets [Abstract]    
Actual 127,374,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
120,819,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose 58,086,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
57,203,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions 72,607,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
71,504,000us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Average assets [Abstract]    
Actual (in hundredths) 8.77%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
8.45%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
For capital adequacy purpose (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
To be well-capitalized under prompt corrective action provisions (in hundredths) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= fnlc_NonConsolidatedMember
Consolidated    
Tier 2 capital to risk-weighted asets [Abstract]    
Actual 139,414,000us-gaap_Capital
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
132,294,000us-gaap_Capital
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
For capital adequacy purpose 68,532,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
66,005,000us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
Risk-weighted assets [Abstract]    
Actual (in hundredths) 16.27%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
16.03%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
For capital adequacy purpose (in hundredths) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
Actual (in hundredths) 15.06%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
14.78%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
For capital adequacy purpose (in hundredths) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
Tier 1 capital to risk-weighted assets [Abstract]    
For capital adequacy purpose 34,266,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
33,002,000us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
Tier 1 capital to average assets [Abstract]    
Actual 128,970,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
121,967,000us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
For capital adequacy purpose $ 58,066,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
$ 56,280,000us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
Average assets [Abstract]    
Actual (in hundredths) 8.88%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
8.67%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
For capital adequacy purpose (in hundredths) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= fnlc_ConsolidatedMember