Organization, Consolidation and Presentation	6 Months Ended
Organization, Consolidation and Presentation	Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure	ORGANIZATION, CONSOLIDATION AND PRESENTATION (a)Business American Coastal Insurance Corporation (referred to in this document as we, our, us, the Company or ACIC) is a property and casualty insurance holding company that sources, writes and services residential commercial and personal property and casualty insurance policies using a network of agents and two wholly-owned insurance subsidiaries. On July 10, 2023, we changed our corporate name from United Insurance Holdings Corp. to American Coastal Insurance Corporation. Our two insurance subsidiaries are Interboro Insurance Company (IIC), acquired via acquisition on April 29, 2016; and American Coastal Insurance Company (AmCoastal), acquired via merger on April 3, 2017. Our other subsidiaries include United Insurance Management, L.C. (UIM), a managing general agent; Skyway Claims Services, LLC (SCS), which provides claims adjusting services to our insurance companies; AmCo Holding Company, LLC (AmCo) which is a holding company subsidiary that consolidates its respective insurance company; BlueLine Cayman Holdings (BlueLine), which reinsures portfolios of excess and surplus policies; UPC Re, which provides a portion of the reinsurance protection purchased by our insurance subsidiaries when needed; Skyway Reinsurance Services, LLC, which provides reinsurance brokerage services for our insurance companies; Skyway Legal Services, LLC (SLS), which provides claims litigation services to our insurance companies; and Skyway Underwriters, LLC, a managing general agent that provides technological and distribution services to our insurance companies. On May 9, 2024, the Company entered into a Stock Purchase Agreement (the "Sale Agreement") with Forza Insurance Holdings, LLC ("Forza") in which ACIC will sell and Forza will acquire 100% of the issued and outstanding stock of IIC. The aggregate purchase price for the shares will be equal to IIC's GAAP shareholders' equity on the closing date. Closing is subject to customary closing conditions, including New York Department of Financial Services ("NYDFS") approval of Forza's application for acquisition of control, and NYDFS approval of a new rate and form filing. As a result, IIC results of operations and assets and liabilities are captured within discontinued operations and are discussed in Note 3 of the Notes to Unaudited Condensed Consolidated Financial Statements below. On February 27, 2023, our former insurance subsidiary, United Property & Casualty Insurance Company (UPC) was placed into receivership with the Florida Department of Financial Services (DFS), which divested our ownership of UPC. The events leading to receivership and results of this subsidiary, now included within discontinued operations, are discussed in Note 3 below. Our primary products are commercial and homeowners' residential property insurance. We currently offer commercial residential insurance in Florida and personal residential insurance in New York. As a result of the Sale Agreement described above and resulting in classification of IIC as discontinued operations, the remaining activity captured within continuing operations supports only our commercial residential insurance offerings. Given this fact pattern, as of June 30, 2024, we conduct our operations under one reportable segment. Our chief operating decision maker is our President. (b)Consolidation and Presentation We prepare our unaudited condensed consolidated interim financial statements in conformity with U.S. generally accepted accounting principles (GAAP). We have condensed or omitted certain information and footnote disclosures normally included in the annual consolidated financial statements presented in accordance with GAAP. In management's opinion, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring items, considered necessary for a fair presentation of interim periods. We include all of our subsidiaries in our consolidated financial statements, eliminating intercompany balances and transactions during consolidation. As described in Note 3, our subsidiary, IIC, and our former subsidiary, UPC, and activities related directly to supporting the business conducted by UPC qualified as discontinued operations. Our unaudited condensed consolidated interim financial statements and footnotes should be read in conjunction with our consolidated financial statements and footnotes in our Annual Report on Form 10-K for the year ended December 31, 2023. While preparing our unaudited condensed consolidated financial statements, we make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements, as well as reported amounts of revenues and expenses during the reporting period. Accordingly, actual results could differ from those estimates. Reported amounts that require us to make extensive use of estimates include our reserves for unpaid losses and loss adjustment expenses, investments and goodwill. Except for the captions on our Unaudited Condensed Consolidated Balance Sheets and Unaudited Condensed Consolidated Statements of Comprehensive Income, we generally use the term loss(es) to collectively refer to both loss and loss adjustment expenses. Our results of operations and our cash flows as of the end of the interim periods reported herein do not necessarily indicate our results for the remainder of the year or for any other future period.