    <SEC-DOCUMENT>0001401521-23-000137-index.html : 20231113
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    <ACCEPTANCE-DATETIME>20231113160147
    ACCESSION NUMBER:		0001401521-23-000137
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		26
    CONFORMED PERIOD OF REPORT:	20231113
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20231113
    DATE AS OF CHANGE:		20231113

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			AMERICAN COASTAL INSURANCE Corp
    		CENTRAL INDEX KEY:			0001401521
    		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
    		IRS NUMBER:				753241967
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-52833
    		FILM NUMBER:		231398446

    	BUSINESS ADDRESS:
    		STREET 1:		800 2ND AVE S
    		CITY:			SAINT PETERSBURG
    		STATE:			FL
    		ZIP:			33701
    		BUSINESS PHONE:		727-895-7737

    	MAIL ADDRESS:
    		STREET 1:		800 2ND AVE S
    		CITY:			SAINT PETERSBURG
    		STATE:			FL
    		ZIP:			33701

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	UNITED INSURANCE HOLDINGS CORP.
    		DATE OF NAME CHANGE:	20081002

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	FMG ACQUISITION CORP
    		DATE OF NAME CHANGE:	20070531
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>acic-20231113.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: acic-20231113.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>exh991er30sep23.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: exh991er30sep23.htm

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    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>investorpresentation-q32.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: investorpresentation-q32.htm

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    <FILENAME>acic-20231113.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
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    <SEQUENCE>19
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    <DESCRIPTION>IDEA: XBRL DOCUMENT
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    <TYPE>EXCEL
    <SEQUENCE>21
    <FILENAME>Financial_Report.xlsx
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    <SEQUENCE>22
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    <SEQUENCE>23
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    <TYPE>XML
    <SEQUENCE>24
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    <TYPE>JSON
    <SEQUENCE>26
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    <TYPE>ZIP
    <SEQUENCE>27
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