Impaired Financing Receivable, Related Allowance, Measured at Fair Value

No definition available.

Name:	fnlc_ImpairedFinancingReceivableRelatedAllowanceMeasuredatFairValue
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents the fair value disclosure of impaired loans that have had a fair value adjustment since their initial recognition.

+ References

No definition available.

+ Details

Name:	fnlc_ImpairedLoansFairValueDisclosure
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other equity securities not previously disclosed.

+ References

No definition available.

+ Details

Name:	fnlc_OtherEquitySecuritiesAvailableForSaleFairValueDisclosure
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the fair value disclosure of other real estate owned that have had a fair value adjustment since their initial recognition.

+ References

No definition available.

+ Details

Name:	fnlc_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.

+ References

No definition available.

+ Details

Name:	fnlc_StateAndMunicipalSecuritiesAvailableForSaleFairValueDisclosure
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Mortgage-Backed Securities
-URI http://asc.fasb.org/extlink&oid=6517959

+ Details

Name:	us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_RealEstateOwnedValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Fair Value Disclosures (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities available for sale, Fair value disclosure
Allowance for loan losses, other real estate owned	$ 162	$ 654	$ 330	$ 373
Allowance for impaired loans	292	1,074
Fair Value, Measurements, Recurring
Securities available for sale, Fair value disclosure
Mortgage-backed securities	195,110	151,855
State and political subdivisions	24,506	30,855
Other equity securities	3,423	2,551
Total assets	223,039	185,261
Fair Value, Measurements, Recurring \| Level 1
Securities available for sale, Fair value disclosure
Mortgage-backed securities	0	0
State and political subdivisions	0	0
Other equity securities	0	0
Total assets	0	0
Fair Value, Measurements, Recurring \| Level 2
Securities available for sale, Fair value disclosure
Mortgage-backed securities	195,110	151,855
State and political subdivisions	24,506	30,855
Other equity securities	3,423	2,551
Total assets	223,039	185,261
Fair Value, Measurements, Recurring \| Level 3
Securities available for sale, Fair value disclosure
Mortgage-backed securities	0	0
State and political subdivisions	0	0
Other equity securities	0	0
Total assets	0	0
Fair Value, Measurements, Nonrecurring
Securities available for sale, Fair value disclosure
Total assets	2,231	5,694
Other real estate owned	1,532	3,785
Impaired loans	699	1,909
Fair Value, Measurements, Nonrecurring \| Level 1
Securities available for sale, Fair value disclosure
Total assets	0	0
Other real estate owned	0	0
Impaired loans	0	0
Fair Value, Measurements, Nonrecurring \| Level 2
Securities available for sale, Fair value disclosure
Total assets	2,231	5,694
Other real estate owned	1,532	3,785
Impaired loans	699	1,909
Fair Value, Measurements, Nonrecurring \| Level 3
Securities available for sale, Fair value disclosure
Total assets	0	0
Other real estate owned	0	0
Impaired loans	$ 0	$ 0