<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>39</ContextCount>
  <ElementCount>254</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>11</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>3</UnitCount>
  <MyReports>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00000002 - Statement - Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/BalanceSheets</Role>
      <ShortName>Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00000003 - Statement - Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/BalanceSheetsParenthetical</Role>
      <ShortName>Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00000004 - Statement - Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/StatementsOfOperations</Role>
      <ShortName>Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00000005 - Statement - Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/StatementsOfCashFlows</Role>
      <ShortName>Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00000006 - Statement - Statements of Cash Flows (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/StatementsOfCashFlowsParenthetical</Role>
      <ShortName>Statements of Cash Flows (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00000007 - Statement - Shareholders Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/ShareholdersEquity</Role>
      <ShortName>Shareholders Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>00000008 - Disclosure - Basis Of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/BasisOfPresentation</Role>
      <ShortName>Basis Of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>00000009 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>00000010 - Disclosure - Fair Value Measurement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurement</Role>
      <ShortName>Fair Value Measurement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>00000011 - Disclosure - Mortgage Loans Receivable and Bond Portfolio</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolio</Role>
      <ShortName>Mortgage Loans Receivable and Bond Portfolio</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>00000012 - Disclosure - Secured Investor Certificates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SecuredInvestorCertificates</Role>
      <ShortName>Secured Investor Certificates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>00000013 - Disclosure - Transactions With Affiliates</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/TransactionsWithAffiliates</Role>
      <ShortName>Transactions With Affiliates</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>00000014 - Disclosure - Line Of Credit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/LineOfCredit</Role>
      <ShortName>Line Of Credit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>00000015 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>00000016 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://church-lonas.net/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>16</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>00000017 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://church-lonas.net/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>17</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>00000018 - Disclosure - Fair Value Measurement (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurementTables</Role>
      <ShortName>Fair Value Measurement (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://church-lonas.net/role/FairValueMeasurement</ParentRole>
      <Position>18</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>00000019 - Disclosure - Mortgage Loans Receivable and Bond Portfolio (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolioTables</Role>
      <ShortName>Mortgage Loans Receivable and Bond Portfolio (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolio</ParentRole>
      <Position>19</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>00000020 - Disclosure - Secured Investor Certificates (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SecuredInvestorCertificatesTables</Role>
      <ShortName>Secured Investor Certificates (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://church-lonas.net/role/SecuredInvestorCertificates</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>00000021 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://church-lonas.net/role/FairValueOfFinancialInstruments</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>00000022 - Disclosure - Summary of Significant Accounting Policies - Allowance for Mortgage Loan Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SummaryOfSignificantAccountingPolicies-AllowanceForMortgageLoanLossesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Allowance for Mortgage Loan Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>00000023 - Disclosure - Fair Value Measurement - Fair Value Measurement Bond Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurement-FairValueMeasurementBondPortfolioDetails</Role>
      <ShortName>Fair Value Measurement - Fair Value Measurement Bond Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>00000024 - Disclosure - Fair Value Measurement - Change In Fair Value Measurement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurement-ChangeInFairValueMeasurementDetails</Role>
      <ShortName>Fair Value Measurement - Change In Fair Value Measurement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>00000025 - Disclosure - Fair Value Measurement - Fair Value Measurement Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurement-FairValueMeasurementNonrecurringBasisDetails</Role>
      <ShortName>Fair Value Measurement - Fair Value Measurement Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>00000026 - Disclosure - Fair Value Measurement - Fair Value Impaired Loans &amp; Real Estate Held For Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurement-FairValueImpairedLoansRealEstateHeldForSaleDetails</Role>
      <ShortName>Fair Value Measurement - Fair Value Impaired Loans &amp; Real Estate Held For Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>00000027 - Disclosure - Mortgage Loans Receivable and Bond Portfolio - Contractual Maturity Mortgage Loans and Bond Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolio-ContractualMaturityMortgageLoansAndBondPortfolioDetails</Role>
      <ShortName>Mortgage Loans Receivable and Bond Portfolio - Contractual Maturity Mortgage Loans and Bond Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>00000028 - Disclosure - Mortgage Loans Receivable and Bond Portfolio - Restructured Mortgage Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolio-RestructuredMortgageLoansDetails</Role>
      <ShortName>Mortgage Loans Receivable and Bond Portfolio - Restructured Mortgage Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>00000029 - Disclosure - Secured Investor Certificates - Maturity Schedule Secured Investor Certificates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SecuredInvestorCertificates-MaturityScheduleSecuredInvestorCertificatesDetails</Role>
      <ShortName>Secured Investor Certificates - Maturity Schedule Secured Investor Certificates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>00000030 - Disclosure - Fair Value of Financial Instruments - Fair Value Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueOfFinancialInstruments-FairValueFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments - Fair Value Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>00000031 - Disclosure - Summary of Significant Accounting Policies (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SummaryOfSignificantAccountingPoliciesDetailsNarrative</Role>
      <ShortName>Summary of Significant Accounting Policies (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/SummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>00000032 - Disclosure - Fair Value Measurement (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/FairValueMeasurementDetailsNarrative</Role>
      <ShortName>Fair Value Measurement (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/FairValueMeasurementTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>00000033 - Disclosure - Mortgage Loans Receivable and Bond Portfolio (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolioDetailsNarrative</Role>
      <ShortName>Mortgage Loans Receivable and Bond Portfolio (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/MortgageLoansReceivableAndBondPortfolioTables</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>00000034 - Disclosure - Secured Investor Certificates (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/SecuredInvestorCertificatesDetailsNarrative</Role>
      <ShortName>Secured Investor Certificates (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/SecuredInvestorCertificatesTables</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>00000035 - Disclosure - Transactions With Affiliates (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/TransactionsWithAffiliatesDetailsNarrative</Role>
      <ShortName>Transactions With Affiliates (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/TransactionsWithAffiliates</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="acmc-20200331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>00000036 - Disclosure - Line Of Credit (Details Narrative)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://church-lonas.net/role/LineOfCreditDetailsNarrative</Role>
      <ShortName>Line Of Credit (Details Narrative)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://church-lonas.net/role/LineOfCredit</ParentRole>
      <Position>36</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>acmc-20200331.xml</File>
    <File>acmc-20200331.xsd</File>
    <File>acmc-20200331_cal.xml</File>
    <File>acmc-20200331_def.xml</File>
    <File>acmc-20200331_lab.xml</File>
    <File>acmc-20200331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
