XML 111 R97.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015
--- | --- | --- | --- | --- | --- | --- | --- | ---
Financial assets |  |  |  |  |  |  |  |
Securities available for sale | $ 300,416 |  |  |  | $ 223,039 |  |  |
Securities to be held to maturity, fair value | 225,537 |  |  |  | 243,123 |  |  |
Restricted equity securities, at cost | 11,930 |  |  |  | 14,257 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Mortgage servicing rights | 1,696 |  |  |  | 1,915 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 140,482 |  |  |  | 130,566 |  |  |
NOW deposits | 282,971 |  |  |  | 242,638 |  |  |
Money market deposits | 125,544 |  |  |  | 92,994 |  |  |
Savings deposits | 217,340 |  |  |  | 206,009 |  |  |
Certificates of deposit | 476,620 |  |  |  | 370,982 |  |  |
Total deposits | 1,242,957 | $ 1,173,749 | $ 1,145,709 | $ 1,109,441 | 1,043,189 | $ 1,058,365 | $ 1,096,323 | $ 966,825
Level 1 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Cash and cash equivalents | 17,366 |  |  |  | 14,299 |  |  |
Interest-bearing deposits in other banks | 293 |  |  |  | 4,013 |  |  |
Securities available for sale | 0 |  |  |  | 0 |  |  |
Securities to be held to maturity, fair value | 0 |  |  |  | 0 |  |  |
Restricted equity securities, at cost | 0 |  |  |  | 0 |  |  |
Loans held for sale | 0 |  |  |  | 0 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Mortgage servicing rights | 0 |  |  |  | 0 |  |  |
Interest rate swap agreements | 0 |  |  |  |  |  |  |
Accrued interest receivable | 0 |  |  |  | 0 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 0 |  |  |  | 0 |  |  |
NOW deposits | 0 |  |  |  | 0 |  |  |
Money market deposits | 0 |  |  |  | 0 |  |  |
Savings deposits | 0 |  |  |  | 0 |  |  |
Certificates of deposit | 0 |  |  |  | 0 |  |  |
National certificates of deposit | 0 |  |  |  | 0 |  |  |
Total deposits | 0 |  |  |  | 0 |  |  |
Repurchase agreements | 0 |  |  |  | 0 |  |  |
Federal Home Loan Bank advances | 0 |  |  |  | 0 |  |  |
Total borrowed funds | 0 |  |  |  | 0 |  |  |
Accrued interest payable | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Real Estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Home Equity LIne of Credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 1 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  | 0 |  |  |
Interest-bearing deposits in other banks | 0 |  |  |  | 0 |  |  |
Securities available for sale | 300,416 |  |  |  | 223,039 |  |  |
Securities to be held to maturity, fair value | 225,537 |  |  |  | 243,123 |  |  |
Restricted equity securities, at cost | 11,930 |  |  |  | 14,257 |  |  |
Loans held for sale | 782 |  |  |  | 349 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 827 |  |  |  | 699 |  |  |
Mortgage servicing rights | 1,696 |  |  |  | 1,915 |  |  |
Interest rate swap agreements | 1,790 |  |  |  |  |  |  |
Accrued interest receivable | 5,532 |  |  |  | 4,912 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 133,342 |  |  |  | 125,651 |  |  |
NOW deposits | 259,418 |  |  |  | 224,627 |  |  |
Money market deposits | 115,087 |  |  |  | 82,050 |  |  |
Savings deposits | 188,260 |  |  |  | 181,010 |  |  |
Certificates of deposit | 209,370 |  |  |  | 201,013 |  |  |
National certificates of deposit | 266,372 |  |  |  | 169,617 |  |  |
Total deposits | 1,171,849 |  |  |  | 983,968 |  |  |
Repurchase agreements | 79,827 |  |  |  | 82,168 |  |  |
Federal Home Loan Bank advances | 193,733 |  |  |  | 250,027 |  |  |
Total borrowed funds | 273,560 |  |  |  | 332,195 |  |  |
Accrued interest payable | 479 |  |  |  | 435 |  |  |
Level 2 | Commercial | Real Estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 558 |  |  |  | 0 |  |  |
Level 2 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 33 |  |  |  | 0 |  |  |
Level 2 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 2 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 236 |  |  |  | 0 |  |  |
Level 2 | Home Equity LIne of Credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 699 |  |  |
Level 2 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 0 |  |  |  | 0 |  |  |
Level 3 |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  |  |  | 0 |  |  |
Interest-bearing deposits in other banks | 0 |  |  |  | 0 |  |  |
Securities available for sale | 0 |  |  |  | 0 |  |  |
Securities to be held to maturity, fair value | 0 |  |  |  | 0 |  |  |
Restricted equity securities, at cost | 0 |  |  |  | 0 |  |  |
Loans held for sale | 0 |  |  |  | 0 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 1,052,987 |  |  |  | 978,008 |  |  |
Mortgage servicing rights | 0 |  |  |  | 0 |  |  |
Interest rate swap agreements | 0 |  |  |  |  |  |  |
Accrued interest receivable | 0 |  |  |  | 0 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 0 |  |  |  | 0 |  |  |
NOW deposits | 0 |  |  |  | 0 |  |  |
Money market deposits | 0 |  |  |  | 0 |  |  |
Savings deposits | 0 |  |  |  | 0 |  |  |
Certificates of deposit | 0 |  |  |  | 0 |  |  |
National certificates of deposit | 0 |  |  |  | 0 |  |  |
Total deposits | 0 |  |  |  | 0 |  |  |
Repurchase agreements | 0 |  |  |  | 0 |  |  |
Federal Home Loan Bank advances | 0 |  |  |  | 0 |  |  |
Total borrowed funds | 0 |  |  |  | 0 |  |  |
Accrued interest payable | 0 |  |  |  | 0 |  |  |
Level 3 | Commercial | Real Estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 292,545 |  |  |  | 262,763 |  |  |
Level 3 | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 24,548 |  |  |  | 23,906 |  |  |
Level 3 | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 147,361 |  |  |  | 126,141 |  |  |
Level 3 | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 27,446 |  |  |  | 20,331 |  |  |
Level 3 | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 18,125 |  |  |  | 8,379 |  |  |
Level 3 | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 410,091 |  |  |  | 405,315 |  |  |
Level 3 | Home Equity LIne of Credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 108,740 |  |  |  | 107,419 |  |  |
Level 3 | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 24,131 |  |  |  | 23,754 |  |  |
Carrying Amount |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Cash and cash equivalents | 17,366 |  |  |  | 14,299 |  |  |
Interest-bearing deposits in other banks | 293 |  |  |  | 4,013 |  |  |
Securities available for sale | 300,416 |  |  |  | 223,039 |  |  |
Securities to be held to maturity, fair value | 226,828 |  |  |  | 240,023 |  |  |
Restricted equity securities, at cost | 11,930 |  |  |  | 14,257 |  |  |
Loans held for sale | 782 |  |  |  | 349 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 1,061,388 |  |  |  | 978,722 |  |  |
Mortgage servicing rights | 1,113 |  |  |  | 1,093 |  |  |
Interest rate swap agreements | 1,790 |  |  |  |  |  |  |
Accrued interest receivable | 5,532 |  |  |  | 4,912 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 140,482 |  |  |  | 130,566 |  |  |
NOW deposits | 282,971 |  |  |  | 242,638 |  |  |
Money market deposits | 125,544 |  |  |  | 92,994 |  |  |
Savings deposits | 217,340 |  |  |  | 206,009 |  |  |
Certificates of deposit | 210,316 |  |  |  | 201,420 |  |  |
National certificates of deposit | 266,304 |  |  |  | 169,562 |  |  |
Total deposits | 1,242,957 |  |  |  | 1,043,189 |  |  |
Repurchase agreements | 84,174 |  |  |  | 87,103 |  |  |
Federal Home Loan Bank advances | 194,727 |  |  |  | 250,354 |  |  |
Total borrowed funds | 278,901 |  |  |  | 337,457 |  |  |
Accrued interest payable | 479 |  |  |  | 435 |  |  |
Carrying Amount | Commercial | Real Estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 297,952 |  |  |  | 265,616 |  |  |
Carrying Amount | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 24,954 |  |  |  | 24,166 |  |  |
Carrying Amount | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 148,737 |  |  |  | 126,551 |  |  |
Carrying Amount | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 27,035 |  |  |  | 19,730 |  |  |
Carrying Amount | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 18,253 |  |  |  | 8,421 |  |  |
Carrying Amount | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 409,999 |  |  |  | 401,315 |  |  |
Carrying Amount | Home Equity LIne of Credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 109,986 |  |  |  | 109,101 |  |  |
Carrying Amount | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 24,472 |  |  |  | 23,822 |  |  |
Estimate of Fair Value |  |  |  |  |  |  |  |
Financial assets |  |  |  |  |  |  |  |
Cash and cash equivalents | 17,366 |  |  |  | 14,299 |  |  |
Interest-bearing deposits in other banks | 293 |  |  |  | 4,013 |  |  |
Securities available for sale | 300,416 |  |  |  | 223,039 |  |  |
Securities to be held to maturity, fair value | 225,537 |  |  |  | 243,123 |  |  |
Restricted equity securities, at cost | 11,930 |  |  |  | 14,257 |  |  |
Loans held for sale | 782 |  |  |  | 349 |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 1,053,814 |  |  |  | 978,707 |  |  |
Mortgage servicing rights | 1,696 |  |  |  | 1,915 |  |  |
Interest rate swap agreements | 1,790 |  |  |  |  |  |  |
Accrued interest receivable | 5,532 |  |  |  | 4,912 |  |  |
Financial liabilities |  |  |  |  |  |  |  |
Demand deposits | 133,342 |  |  |  | 125,651 |  |  |
NOW deposits | 259,418 |  |  |  | 224,627 |  |  |
Money market deposits | 115,087 |  |  |  | 82,050 |  |  |
Savings deposits | 188,260 |  |  |  | 181,010 |  |  |
Certificates of deposit | 209,370 |  |  |  | 201,013 |  |  |
National certificates of deposit | 266,372 |  |  |  | 169,617 |  |  |
Total deposits | 1,171,849 |  |  |  | 983,968 |  |  |
Repurchase agreements | 79,827 |  |  |  | 82,168 |  |  |
Federal Home Loan Bank advances | 193,733 |  |  |  | 250,027 |  |  |
Total borrowed funds | 273,560 |  |  |  | 332,195 |  |  |
Accrued interest payable | 479 |  |  |  | 435 |  |  |
Estimate of Fair Value | Commercial | Real Estate |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 293,103 |  |  |  | 262,763 |  |  |
Estimate of Fair Value | Commercial | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 24,548 |  |  |  | 23,906 |  |  |
Estimate of Fair Value | Commercial | Other |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 147,394 |  |  |  | 126,141 |  |  |
Estimate of Fair Value | Municipal |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 27,446 |  |  |  | 20,331 |  |  |
Estimate of Fair Value | Residential | Construction |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 18,125 |  |  |  | 8,379 |  |  |
Estimate of Fair Value | Residential | Term |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 410,327 |  |  |  | 405,315 |  |  |
Estimate of Fair Value | Home Equity LIne of Credit |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | 108,740 |  |  |  | 108,118 |  |  |
Estimate of Fair Value | Consumer |  |  |  |  |  |  |  |
Loans (net of allowance for loan losses) [Abstract] |  |  |  |  |  |  |  |
Loans | $ 24,131 |  |  |  | $ 23,754 |  |  |

X
- Definition Represents the portion of the balance sheet assertion valued at fair value whether such amount is presented as a separate caption or as a parenthetical disclosure. Element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. May be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on an entity's books for accrued interest receivable. + References No definition available. + Details
Name: | fnlc_AccruedInterestReceivableFairValueDisclosure
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | fnlc_LoansNetOfAllowanceForLoanLossesAbstract
Namespace Prefix: | fnlc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate amount of national time deposits, including certificates of deposits, individual retirement accounts and open accounts. + References No definition available. + Details
Name: | fnlc_NationalCertificatesOfDeposit
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of stock held at Federal Home Loan Bank and Federal Reserve Bank. Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank Stock represents an equity interest in a FHLB of FRB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References No definition available. + Details
Name: | fnlc_RestrictedEquitySecuritiesAtCost
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of accrued expenses. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccruedLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
Name: | us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + 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 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice. + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DemandDepositAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DepositsMoneyMarketDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written. + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DepositsNegotiableOrderOfWithdrawalNOW
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + 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 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DepositsSavingsDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64702-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesLongTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + 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 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530178&loc=d3e59706-112781 + Details
Name: | us-gaap_InterestBearingDepositsInBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
Name: | us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnlc_OtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fnlc_MunicipalPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fnlc_TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fnlc_HomeEquityLIneofCreditPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |