Basis of Presentation	3 Months Ended
Basis of Presentation	Mar. 31, 2022
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 2022 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2022. 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, 2021. Risks and Uncertainties In March 2020, the World Health Organization declared a worldwide pandemic as a result of the outbreak of coronavirus disease 2019 ("COVID-19"). The impact of COVID-19 continues to cause varying levels of disruption and uncertainty in the local, national, and world economies. To curtail spread of the virus, governments at all levels encouraged social distancing and many imposed restrictions on travel and group meetings, and/or mandated shut-downs of all but essential businesses. Vaccination efforts have led to a general re-opening of the economy with few remaining restrictions. 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. In 2020, COVID-19 adversely impacted the tourism industry to a greater degree than other industries; in 2021 the tourism industry rebounded and by all accounts businesses in the sector generally enjoyed a strong year. The milder Omicron variants of COVID-19 have become the dominant strains with outbreaks resulting in modest levels of disruption. The severity of any potential future outbreaks could have an impact on the Company's operating results, though the degree is indeterminable at this time. The conflict between Russia and Ukraine has exacerbated pandemic-related supply chain issues, upset numerous global markets including energy and certain raw materials, and generally added to economic uncertainty and geopolitical instability. Any or all could have negative downstream effects on the Company's operating results, the extent of which is indeterminable at this time. Subsequent Events Events occurring subsequent to March 31, 2022, have been evaluated as to their potential impact to the financial statements.