<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ck0001690012-20260528.xsd" xlink:type="simple"/>
    <context id="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001690012</identifier>
        </entity>
        <period>
            <startDate>2026-05-28</startDate>
            <endDate>2026-05-28</endDate>
        </period>
    </context>
    <dei:EntityCentralIndexKey
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_658c4aaa-6529-40c9-8f6c-4b53a1a69b65">0001690012</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_359d2d24-dd74-4747-baed-a002d08e1198">false</dei:AmendmentFlag>
    <dei:DocumentType
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_4837358b-8120-4e13-afca-dfe5a08f1fb9">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_ed189253-a05d-4b95-bbda-daebb77f13a4">2026-05-28</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_076fea88-d897-4cf4-9a7b-c61a97c6327e">InPoint Commercial Real Estate Income, Inc.</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_7bc6a879-7797-4607-9472-6c78d15084e4">MD</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_f8932682-d9b0-44c5-845f-044e0faffbb9">001-40833</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_327efef6-7d11-40e8-a683-c3ee356e593a">32-0506267</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_b75dd7e4-7e61-4dfd-b7b0-c58aa5fa465a">2901 Butterfield Road</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_9ab88403-4709-4a98-a963-3b526f12c8b7">Oak Brook</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_168c3d47-16f3-4d5c-9ea4-296b199dd571">IL</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_253db61f-08ba-4562-8744-4c709e753c54">60523</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_fccdcb1d-02fc-44ef-9b91-63b29ecc7819">(800)</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_c5af537e-e7f8-4f75-ab16-02ed95c819ee">826-8228</dei:LocalPhoneNumber>
    <dei:EntityInformationFormerLegalOrRegisteredName
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_d24ea411-340a-4a54-8f76-f3c3b84aa794">N/A</dei:EntityInformationFormerLegalOrRegisteredName>
    <dei:WrittenCommunications
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_3ce9931d-63ff-470a-aaf0-82c705763d44">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_a2d57e15-3612-4deb-b342-8558fc3a2da4">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_a6744cd6-0959-435a-bb93-d8b0825246e5">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_db68392e-79e9-4794-9c57-c4d428c8fd98">false</dei:PreCommencementIssuerTenderOffer>
    <dei:Security12bTitle
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_f16831cb-f45d-403f-9e72-1f72239ead26">6.75% Series A Cumulative Redeemable Preferred Stock, par value $0.001 per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_417764c1-a48d-4b8b-9736-5ac3ad815903">ICR PR A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_20010231-3334-4018-99ba-510c3cc59c21">NYSE</dei:SecurityExchangeName>
    <dei:EntityEmergingGrowthCompany
      contextRef="C_df9d7f3c-183d-44ce-aa1e-e6ea30b795a6"
      id="F_ac3fb8c1-d202-4c6f-a23f-c61f02600620">false</dei:EntityEmergingGrowthCompany>
</xbrl>
