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Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2022
Accounting Policies [Abstract] |
Nature of Operations [Policy Text Block] | Nature of Operations NSTS Bancorp, Inc. (“NSTS” or the “Company”, “we” or “our”) was formed to serve as the stock holding company for North Shore Trust and Savings (the “Bank”) in connection with the conversion of North Shore Trust and Savings, NSTS Financial Corporation and North Shore MHC, into the stock form of organization, which was completed on January 18, 2022. Accordingly, certain financial statements and other financial information at or prior to January 18, 2022, contained in this Form 10-Q relate solely to the consolidated financial results of North Shore MHC and its consolidated subsidiaries, NSTS Financial Corporation and North Shore Trust and Savings. NSTS Bancorp, Inc. completed its stock offering on January 18, 2022. The Company sold 5,290,000 shares of common stock at $10.00 per share in its subscription offering for gross proceeds of approximately $53.0 million. In connection with the subscription offering, NSTS Bancorp, Inc. also issued 107,959 shares of common stock and $150,000 in cash to NSTS Charitable Foundation. Shares of NSTS Bancorp, Inc. stock began trading on January 19, 2022 on the Nasdaq Capital Market under the trading symbol "NSTS." The Bank operates primarily in the northern suburbs of Chicago, Illinois. The Bank offers a variety of financial services to customers in the surrounding community. Financial services consist primarily of 1-4 family mortgage loans, savings accounts, and certificate of deposit accounts. There are no significant concentrations of loans to any one industry or customer. The Bank’s exposure to credit risk is significantly affected by changes in the economy in the Bank’s market area.
Employee Retention Credit [Policy Text Block] | Employee Retention Credit Under the provisions of the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) signed into law on March 27, 2020 and the subsequent extension of the CARES Act, the Company was eligible for a refundable employee retention credit subject to certain criteria. The Bank qualifies for the tax credit for the quarters ended June 30, 2021 and September 30, 2021 under the CARES Act. The Bank utilized the gross receipts method of calculating eligibility. Based on the eligibility, the tax credit is equal to 70% of qualified wages paid to employees during a quarter, and the limit on qualified wages per employee is $10,000 of qualified wages per quarter. The Employee Retention Credit was recorded during the second quarter of 2022, when the Bank determined they were eligible. The credit is recorded as other non-interest income and offsets $503,000 of salaries and employee benefits previously recorded as an expense during 2021. As of June 30, 2022 cannot reasonably estimate when it will receive the refunds. The receivable is recorded in other assets on the Consolidated Balance Sheets. The CARES Act and related Employee Retention Credit was terminated as of September 30, 2021, and therefore the Company does not expect to file for any additional refunds.
Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation The accompanying unaudited Consolidated Financial Statements were prepared in accordance with GAAP and the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the North Shore MHC’s Consolidated Financial Statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. The unaudited Consolidated Financial Statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Management is required 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 and the reported amounts of revenue and expenses during the reporting period. Actual results may vary from those estimates. Material estimates that could significantly change in the near-term include the adequacy of the allowance for loan losses, determination of the valuation allowance on deferred tax assets and the valuation of investment securities and the related tax effect. The results of operations for the three and six months ended June 30, 2022, are not necessarily indicative of results that may be expected for any other interim period or the entire fiscal year ending December 31, 2022. Certain amounts in prior year financial statements have been reclassified to conform to the current presentation. Subsequent events have been evaluated through the date of issuance of the unaudited Consolidated Financial Statements. No significant subsequent events have occurred through this date requiring adjustment to the financial statements or disclosures. With the exception of the following new significant accounting and reporting policies, the Company has not changed its significant accounting and reporting policies from those disclosed in the Company’s Form 10-K for the year ended December 31, 2021.
Employee Stock Ownership Plan (ESOP), Policy [Policy Text Block] | Employee Stock Ownership Plan The ESOP shares pledged as collateral are reported as unearned ESOP shares in the Consolidated Statements of Financial Condition. As shares are committed to be released from collateral, the Bank reports compensation expense equal to the average market price of the shares during the year, and the shares become outstanding for basic net income per common share computations. Dividends on allocated ESOP shares reduce retained earnings; dividends on unearned ESOP shares reduce the ESOP’s debt and accrued interest.
Earnings Per Share, Policy [Policy Text Block] | Earnings per Share Basic earnings per share represents income available to common stockholders divided by the weighted-average number of common shares outstanding during the period. Unallocated ESOP shares are not deemed outstanding for earnings per share calculations. ESOP shares committed to be released are considered to be outstanding for purposes of the earnings per share computation. ESOP shares that have not been legally released, but that relate to employee services rendered during an accounting period (interim or annual) ending before the related debt service payment is made, are considered committed to be released. Diluted earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued, as well as any adjustment to income that would result from the assumed issuance.
New Accounting Pronouncements, Policy [Policy Text Block] | Accounting Developments Accounting for Financial Instruments – Credit Losses The FASB issued ASU No. 2016-13, Financial Instruments— Credit Losses (Topic 326). The ASU introduces a new credit loss model, the current expected credit loss model (CECL), which requires earlier recognition of credit losses, while also providing additional transparency about credit risk. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses for loans, held-to-maturity securities, and other receivables at the time the financial asset is originated or acquired. The expected credit losses are adjusted each period for changes in expected lifetime credit losses. For available for-sale securities where fair value is less than cost, credit-related impairment, if any, will be recognized in an allowance for credit losses and adjusted each period for changes in expected credit risk. This model replaces the multiple existing impairment models, which generally require that a loss be incurred before it is recognized. The CECL model represents a significant change from existing practice and may result in material changes to the Bank’s accounting for financial instruments. The Bank is evaluating the effect ASU 2016-13 will have on its consolidated financial statements and related disclosures. The impact of the ASU will depend upon the final standard (as amended), the state of the economy, and the nature of the Bank’s portfolios at the date of adoption. For the Bank, the new standard is effective January 2023.

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- Definition Disclosure of accounting policy for employee retention credit. + References No definition available. + Details
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- Definition Disclosure of accounting policy for nature of operations. + References No definition available. + Details
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- Definition Disclosure of accounting policy for 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 No definition available. + Details
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- Definition Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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- Definition Disclosure of accounting policy for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt new guidance and new ESOP shares for which new guidance is required, these disclosures are required for both blocks of shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact. + References No definition available. + Details
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