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Note 1 - Basis of Presentation | 6 Months Ended
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Jun. 30, 2026
Notes to Financial Statements |
Basis of Accounting [Text Block] | 1. BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements of First Northern Community Bancorp (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. The results of operations for any interim period are not necessarily indicative of results expected for the full year. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 as filed with the Securities and Exchange Commission ("SEC"). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements as well as reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates. All material intercompany balances and transactions have been eliminated in consolidation.

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- Definition The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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