Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Hawthorn Bancshares, Inc. (the “Company”) through its subsidiary, Hawthorn Bank (the “Bank”), provides a broad range of banking services to individual and corporate customers located within the Missouri communities in and surrounding Jefferson City, Columbia, Clinton, Warsaw, Springfield, and the greater Kansas City metropolitan area. The Company is subject to competition from other financial and nonfinancial institutions that provide financial products and services. Additionally, the Company and its subsidiaries are subject to the regulations of certain regulatory agencies and undergo periodic examinations by those regulatory agencies. The accompanying unaudited consolidated financial statements of the Company have been prepared in conformity with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q, and Rule 10-01 of Regulation S-X. Accordingly, the unaudited consolidated financial statements do not include all of the information and disclosures required by U.S. GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. The preparation of the consolidated financial statements includes all adjustments that, in the opinion of management, are necessary in order to make those statements not misleading. Management is required to make estimates and assumptions, including the determination of the allowance for credit losses, real estate acquired in connection with foreclosure or in satisfaction of loans, and fair values of investment securities available-for-sale that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Recent Developments One Big Beautiful Bill Act. On July 4, 2025, the One Big Beautiful Bill Act (the “OBBBA”), which includes a broad range of tax reform provisions, was signed into law in the United States. The OBBBA tax provisions have multiple effective dates, with certain provisions effective in 2025 and others being phased in through 2027. The Company is continuing to evaluate the effect that the OBBBA will have on the Company’s financial condition, but does not currently expect it will have a material impact on its results of operations. Shelf Registration. On June 24, 2025, the Company filed a universal shelf registration statement on Form S-3 with the Securities and Exchange Commission, which became effective on July 2, 2025. The shelf registration statement is intended to provide the Company with financial flexibility to raise capital from the offering of up to $150 million of any combination of common stock, preferred stock, debt securities, depositary shares, warrants, purchase contracts, purchase units, subscription rights and units in one or multiple offerings while the shelf registration statement is effective. Failed Sale-Leaseback/Financing Obligation. During the quarter, the Company transferred legal title to certain real estate and entered into a related lease and development arrangement with the buyer. The transaction did not qualify as a sale under ASC 842 because control did not transfer under ASC 606 due to continuing involvement, including contractual provisions that affect the transfer of control. Accordingly, the Company continues to recognize the real estate within premises and equipment and recorded the $1.9 million of proceeds received as a financing obligation. The financing obligation is subsequently accounted for under the effective interest method and periodic payments are allocated between interest expense and reduction of the financing obligation. Proceeds received are presented as financing cash inflows and principal repayments as financing cash outflows in the statement of cash flows. Recent Accounting Pronouncements Income Statement. In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this ASU require public companies to disclose, in the notes to the financial statements, specified information about certain costs and expenses at each interim and annual reporting period. Additionally, in January 2025, the FASB issued ASU No. 2025-01, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date. The ASU addresses investors requests for more disaggregated expense information to better understand an entity's performance, better assess the entity's prospects for future cash flows, and compare an entity's performance over time and with that of other entities. This ASU amends the effective date of ASU No. 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU No. 2024-03 is permitted. The Company is currently evaluating the impact of the ASU on the Company’s consolidated financial statements.