Organization, Consolidation and Presentation	9 Months Ended
Sep. 30, 2023
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. Our primary products are commercial and homeowners' residential property insurance. We currently offer commercial residential insurance in Florida. During 2022, we also wrote commercial residential insurance in South Carolina and Texas, however, effective May 1, 2022, we no longer write in these states. In addition, we write personal residential insurance in New York. During 2022, we wrote personal residential business in six other states; however 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. On August 25, 2022, we announced that our former subsidiary UPC had filed plans for withdrawal in the states of Florida, Louisiana, and Texas and intended to file a plan for withdrawal in the state of New York. All filed plans entail non-renewing personal lines policies in these states. Additionally, we announced that Demotech, Inc. (Demotech), an insurance rating agency, notified UPC of its intent to withdraw UPC's Financial Stability Rating. On December 5, 2022, the Florida Office of Insurance Regulation ("FLOIR") issued Consent Order No. 303643-22- CO that provided for the administrative supervision and approval of the plan of run-off for UPC (the "Consent Order"). The Consent Order provided formal approval of UPC's Plan of Run-Off (the "Plan") to facilitate a solvent wind down of its affairs in an orderly fashion. Additionally, in connection with the Plan, IIC agreed to not pay ordinary dividends without the prior approval of the New York Department of Financial Services until January 1, 2025. On February 10, 2023, we announced that a solvent run-off of UPC was unlikely and on February 27, 2023, UPC was placed into receivership with the DFS which divested our ownership of UPC. Effective June 1, 2022, we merged our majority-owned insurance subsidiary, Journey Insurance Company (JIC) into AmCoastal, with AmCoastal being the surviving entity. JIC was formed in strategic partnership with a subsidiary of Tokio Marine Kiln Group Limited (Kiln) on August 30, 2018 and operated independently from AmCoastal prior to the merging of the entities. The Kiln subsidiary held a noncontrolling interest in JIC, which was terminated prior to the merger. Effective June 1, 2022, we entered into a quota share reinsurance agreement with TypTap Insurance Company (Typtap). Under the terms of this agreement, we ceded 100% of our former subsidiary UPC's in-force, new, and renewal policies in the states of Georgia, North Carolina and South Carolina. Effective June 1, 2022, we began the transition of South Carolina policies to Homeowners Choice Property and Casualty Insurance Company, Inc. (HCPCI) in connection with our renewal rights agreement. Effective October 1, 2022, we transitioned Georgia policies to HCPCI in connection with our renewal rights agreement. Effective December 1, 2022, we began the transition of North Carolina policies to HCPCI in connection with our renewal rights agreement. As a result, these policies will no longer be covered under this agreement upon their renewal. This agreement replaces the 85% quota share agreement with HCPCI effective December 31, 2021. Effective May 31, 2022, we merged Family Security Insurance Company, Inc. (FSIC) into our former subsidiary UPC, with UPC being the surviving entity. FSIC was acquired via merger on February 3, 2015, and operated independently from UPC prior to the merging of the entities. In conjunction with the merger, we dissolved Family Security Holdings (FSH), a holding company subsidiary that consolidated its respective insurance company, FSIC. Effective June 1, 2021, we entered into a quota share reinsurance agreement with HCPCI and TypTap. Under the terms of this agreement, we ceded 100% of our former subsidiary UPC's in-force, new, and renewal policies in the states of Connecticut, New Jersey, Massachusetts, and Rhode Island. The cession of these policies was 50% to HCPCI and 50% to TypTap. HCPCI is responsible for processing all claims as a part of this agreement. As of April 1, 2022, we completed the transition of all policies in these four states to HCPCI in connection with our renewal rights agreement (Northeast Renewal Agreement) to sell UPC's personal lines homeowners business in these states. We conduct our operations under two reportable segments, commercial residential property and casualty insurance policies (commercial lines) and personal residential property and casualty insurance policies (personal lines). Our chief operating decision maker is our President, who makes decisions to allocate resources and assesses performance at both segment levels, as well as at the corporate level. (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 2, 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, 2022. 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 Loss, 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. (c) Going Concern Our unaudited condensed consolidated interim financial statements have been prepared in accordance with GAAP assuming the Company will continue as a going concern. As disclosed in our Annual Report on Form 10-K for the year ended December 31, 2022, our subsidiary AmCoastal is a part of a combined reinsurance program with our former subsidiary, UPC. To properly allocate the reinsurance recoverables under the shared catastrophe treaties, UPC and AmCoastal entered into a reinsurance allocation agreement that became effective on June 1, 2022 (the "Allocation Agreement"). The Allocation Agreement was filed with and approved by the FLOIR on December 5, 2022. On February 10, 2023, we announced that a solvent run-off of UPC was unlikely, driven by Hurricane Ian losses which exhausted UPC's reinsurance coverage. On February 27, 2023, UPC was placed into receivership with the DFS which divested our ownership of UPC. As of the date of filing our Annual Report, the DFS had not recognized the Allocation Agreement, leaving uncertainty regarding the timing of both recoveries currently held by UPC that are allocated to AmCoastal and future recoverables. Management also believed that the ability for AmCoastal to obtain adequate reinsurance to meet its needs for the June 1, 2023 to May 31, 2024 catastrophe cover could only be accomplished assuming that recoveries due to AmCoastal pursuant to the Allocation Agreement could be resolved in short order. However, on April 19, 2023, AmCoastal entered into a Memorandum of Understanding with the DFS. Under the terms of the Memorandum, AmCoastal and the DFS as receiver of UPC have reached the following agreement: 1.The DFS adopts, ratifies and affirms the Allocation Agreement. 2.All future reinsurance recoverable under reinsurance agreements applicable to the Allocation Agreement for Hurricane Ian losses shall be paid, either directly from the reinsurers or directly from the reinsurance intermediary responsible therefor, to AmCoastal. If a true up adjustment demonstrates that any future reinsurance recoveries were over-collected by AmCoastal, AmCoastal will remit any over-payment to UPC. On May 15, 2023, the Company, together with its subsidiary, AmCoastal, entered into a Tax Memorandum of Understanding (the "Tax Memorandum") with the DFS as receiver of the Company's former subsidiary, UPC. On February 27, 2023, UPC entered into receivership with the DFS as receiver. As of March 31, 2023, in accordance with the various reinsurance allocation agreements including the Allocation Agreement described above, the Company was due approximately $38,352,000 of net reinsurance recoveries received by UPC on behalf of the Company but not settled prior to receivership. In addition, in April ACIC paid reinsurance premiums on behalf of UPC totaling $12,929,000. The Company and the DFS believe that an opportunity exists to settle these balances via the realization of certain deferred tax assets of the Company's consolidated Federal and Florida tax returns to which ACIC and UPC belong. UPC holds certain deferred tax assets that are believed to be of no value to UPC on a stand-alone basis. However, AmCoastal and the Company have the opportunity, subject to certain conditions such as continuing and adequate profitability, to realize these assets. Under the terms of the Tax Memorandum, the Company, AmCoastal and the DFS as receiver of UPC have reached the following agreement: 1.The parties agree to cooperate with one another to achieve realization of the deferred tax assets; 2.The parties agree to deposit the funds that are or may be due to UPC pursuant to the Tax Allocation Agreement into a segregated account (the "DTA Account") held by AmCoastal that will serve as collateral for any amount payable from or to UPC; 3.The parties agree that the Federal Income Tax Allocation Agreement entered into prior to UPC’s receivership is ratified and accepted by all parties; 4.The parties agree to an annual “true up” of the allocation of the disputed recoveries to the extent that such recoveries were not allocated correctly according to the Reinsurance Allocation Agreement; 5.In the event that AmCoastal, ACIC, or any of their affiliates make a claim or file a proof of claim in the UPC estate, the reviewed, approved, and/or adjudicated claim shall be reduced by the amount of (a) any tax benefit collectively received by AmCoastal, ACIC, or any of their affiliates as well as (b) any money withdrawn from the DTA Account for the benefit of any entity other than UPC; and 6.In the event that the benefit received by the Company is greater than the disputed recoveries, the difference shall be paid to DFS as receiver of UPC. The Tax Memorandum allows the Company to secure amounts due from UPC to AmCoastal provided the Internal Revenue Service (IRS) does not object to the Company utilizing UPC's net operating loss carry-forward against its future taxable income. We believe the probability of the IRS allowing the Company to utilize UPC's net operating losses is more likely than not based on other entities having successfully accomplished this and prior permission or approval from the IRS not being required. The Company has begun the process of obtaining a private letter ruling from the IRS on this matter. The execution of these MOUs prior to June 30, 2023 alleviated the uncertainty regarding future recoverables, and recoveries currently held by UPC. In addition, as of June 30, 2023, the Company has finalized its reinsurance cover, alleviating the uncertainty of this placement. As a result, the Company has concluded as of June 30, 2023 that substantial doubt no longer exists regarding its ability to continue as a going concern.

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.

Our primary products are commercial and homeowners' residential property insurance. We currently offer commercial residential insurance in Florida. During 2022, we also wrote commercial residential insurance in South Carolina and Texas, however, effective May 1, 2022, we no longer write in these states. In addition, we write personal residential insurance in New York. During 2022, we wrote personal residential business in six other states; however 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.

On August 25, 2022, we announced that our former subsidiary UPC had filed plans for withdrawal in the states of Florida, Louisiana, and Texas and intended to file a plan for withdrawal in the state of New York. All filed plans entail non-renewing personal lines policies in these states. Additionally, we announced that Demotech, Inc. (Demotech), an insurance rating agency, notified UPC of its intent to withdraw UPC's Financial Stability Rating. On December 5, 2022, the Florida Office of Insurance Regulation ("FLOIR") issued Consent Order No. 303643-22- CO that provided for the administrative supervision and approval of the plan of run-off for UPC (the "Consent Order"). The Consent Order provided formal approval of UPC's Plan of Run-Off (the "Plan") to facilitate a solvent wind down of its affairs in an orderly fashion. Additionally, in connection with the Plan, IIC agreed to not pay ordinary dividends without the prior approval of the New York Department of Financial Services until January 1, 2025. On February 10, 2023, we announced that a solvent run-off of UPC was unlikely and on February 27, 2023, UPC was placed into receivership with the DFS which divested our ownership of UPC.

Effective June 1, 2022, we merged our majority-owned insurance subsidiary, Journey Insurance Company (JIC) into AmCoastal, with AmCoastal being the surviving entity. JIC was formed in strategic partnership with a subsidiary of Tokio Marine Kiln Group Limited (Kiln) on August 30, 2018 and operated independently from AmCoastal prior to the merging of the entities. The Kiln subsidiary held a noncontrolling interest in JIC, which was terminated prior to the merger.

Effective June 1, 2022, we entered into a quota share reinsurance agreement with TypTap Insurance Company (Typtap). Under the terms of this agreement, we ceded 100% of our former subsidiary UPC's in-force, new, and renewal policies in the states of Georgia, North Carolina and South Carolina. Effective June 1, 2022, we began the transition of South Carolina policies to Homeowners Choice Property and Casualty Insurance Company, Inc. (HCPCI) in connection with our renewal rights agreement. Effective October 1, 2022, we transitioned Georgia policies to HCPCI in connection with our renewal rights agreement. Effective December 1, 2022, we began the transition of North Carolina policies to HCPCI in connection with our renewal rights agreement. As a result, these policies will no longer be covered under this agreement upon their renewal. This agreement replaces the 85% quota share agreement with HCPCI effective December 31, 2021.

Effective June 1, 2021, we entered into a quota share reinsurance agreement with HCPCI and TypTap. Under the terms of this agreement, we ceded 100% of our former subsidiary UPC's in-force, new, and renewal policies in the states of Connecticut, New Jersey, Massachusetts, and Rhode Island. The cession of these policies was 50% to HCPCI and 50% to TypTap. HCPCI is responsible for processing all claims as a part of this agreement. As of April 1, 2022, we completed the transition of all policies in these four states to HCPCI in connection with our renewal rights agreement (Northeast Renewal Agreement) to sell UPC's personal lines homeowners business in these states.

We conduct our operations under two reportable segments, commercial residential property and casualty insurance policies (commercial lines) and personal residential property and casualty insurance policies (personal lines). Our chief operating decision maker is our President, who makes decisions to allocate resources and assesses performance at both segment levels, as well as at the corporate level.

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 2, 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, 2022.

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 Loss, we generally use the term loss(es) to collectively refer to both loss and loss adjustment expenses.

Our unaudited condensed consolidated interim financial statements have been prepared in accordance with GAAP assuming the Company will continue as a going concern. As disclosed in our Annual Report on Form 10-K for the year ended December 31, 2022, our subsidiary AmCoastal is a part of a combined reinsurance program with our former subsidiary, UPC.

To properly allocate the reinsurance recoverables under the shared catastrophe treaties, UPC and AmCoastal entered into a reinsurance allocation agreement that became effective on June 1, 2022 (the "Allocation Agreement"). The Allocation Agreement was filed with and approved by the FLOIR on December 5, 2022. On February 10, 2023, we announced that a solvent run-off of UPC was unlikely, driven by Hurricane Ian losses which exhausted UPC's reinsurance coverage. On February 27, 2023, UPC was placed into receivership with the DFS which divested our ownership of UPC. As of the date of filing our Annual Report, the DFS had not recognized the Allocation Agreement, leaving uncertainty regarding the timing of both recoveries currently held by UPC that are allocated to AmCoastal and future recoverables. Management also believed that the ability for AmCoastal to obtain adequate reinsurance to meet its needs for the June 1, 2023 to May 31, 2024 catastrophe cover could only be accomplished assuming that recoveries due to AmCoastal pursuant to the Allocation Agreement could be resolved in short order.

2.All future reinsurance recoverable under reinsurance agreements applicable to the Allocation Agreement for Hurricane Ian losses shall be paid, either directly from the reinsurers or directly from the reinsurance intermediary responsible therefor, to AmCoastal. If a true up adjustment demonstrates that any future reinsurance recoveries were over-collected by AmCoastal, AmCoastal will remit any over-payment to UPC.

On May 15, 2023, the Company, together with its subsidiary, AmCoastal, entered into a Tax Memorandum of Understanding (the "Tax Memorandum") with the DFS as receiver of the Company's former subsidiary, UPC. On February 27, 2023, UPC entered into receivership with the DFS as receiver. As of March 31, 2023, in accordance with the various reinsurance allocation agreements including the Allocation Agreement described above, the Company was due approximately $38,352,000 of net reinsurance recoveries received by UPC on behalf of the Company but not settled prior to receivership. In addition, in April ACIC paid reinsurance premiums on behalf of UPC totaling $12,929,000. The Company and the DFS believe that an opportunity exists to settle these balances via the realization of certain deferred tax assets of the Company's consolidated Federal and Florida tax returns to which ACIC and UPC belong. UPC holds certain deferred tax assets that are believed to be of no value to UPC on a stand-alone basis. However, AmCoastal and the Company have the opportunity, subject to certain conditions such as continuing and adequate profitability, to realize these assets. Under the terms of the Tax Memorandum, the Company, AmCoastal and the DFS as receiver of UPC have reached the following agreement:

5.In the event that AmCoastal, ACIC, or any of their affiliates make a claim or file a proof of claim in the UPC estate, the reviewed, approved, and/or adjudicated claim shall be reduced by the amount of (a) any tax benefit collectively received by AmCoastal, ACIC, or any of their affiliates as well as (b) any money withdrawn from the DTA Account for the benefit of any entity other than UPC; and

The Tax Memorandum allows the Company to secure amounts due from UPC to AmCoastal provided the Internal Revenue Service (IRS) does not object to the Company utilizing UPC's net operating loss carry-forward against its future taxable income. We believe the probability of the IRS allowing the Company to utilize UPC's net operating losses is more likely than not based on other entities having successfully accomplished this and prior permission or approval from the IRS not being required. The Company has begun the process of obtaining a private letter ruling from the IRS on this matter.

The execution of these MOUs prior to June 30, 2023 alleviated the uncertainty regarding future recoverables, and recoveries currently held by UPC. In addition, as of June 30, 2023, the Company has finalized its reinsurance cover, alleviating the uncertainty of this placement. As a result, the Company has concluded as of June 30, 2023 that substantial doubt no longer exists regarding its ability to continue as a going concern.