Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The First Bancorp, Inc. ("the Company") is a financial holding company that owns all of the common stock of First National Bank ("the Bank"). The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of Management, all adjustments (consisting of normally recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany transactions and balances are eliminated in consolidation. The income reported for the 2020 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2020. For further information, refer to the consolidated financial statements and notes included in the Company's annual report on Form 10-K for the year ended December 31, 2019. Risks and Uncertainties The impact of the coronavirus disease (COVID-19) continues to cause disruption and uncertainty in the local, national, and world economies. To curtail spread of the virus, governments at all levels have encouraged social distancing and many have imposed restrictions on travel and group meetings, and/or mandated shut-downs of all but essential businesses. The pace of re-opening varies across the United States, and certain locations have reimposed restrictions after experiencing increases in infection rates. Much of the unprecedented uncertainty surrounding the duration of the pandemic, its potential economic ramifications, and any government actions to mitigate them initially experienced in the first quarter of 2020 has continued in the second quarter and early stages of the the third quarter. The Company’s business, financial condition and results of operations generally rely upon the ability of the Bank’s borrowers to repay their loans, the value of collateral underlying the Bank’s secured loans, and demand for loans and other products and services the Bank offers, which are highly dependent on the business environment in the Bank’s primary markets where it operates and in the United States as a whole. The Bank's primary market is the State of Maine, which relies upon tourism for a significant percentage of its economic activity. COVID-19 is expected to adversely impact the tourism industry to a greater degree than other industries, however, it remains the case that an assessment of the impact cannot be completed with a high degree of certainty at this time. In addition to loans, demand for other products and services could be impacted by COVID-19. Depositors and other funding sources may be unwilling to renew certificates of deposit or other types of funding, or may only be willing to do so on terms, including higher interest rates, that are materially less favorable than the Bank has experienced in the recent past. Certain fee based activities such as service charges, interchange revenues, and wealth management activity, could be impacted due to lower activity or market declines. Accordingly, while management expects this matter to likely have a negative financial impact on the Company's financial position and results of future operations, such potential impact cannot be reasonably estimated as of the date of this report, August 7, 2020. Subsequent Events Events occurring subsequent to June 30, 2020, have been evaluated as to their potential impact to the financial statements.