<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>555</ContextCount>
  <ElementCount>652</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>127</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-document-and-entity-information</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-balance-sheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100050 - Statement - Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-balance-sheets-parentheticals</Role>
      <ShortName>Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100060 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-statements-of-income</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100070 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-statements-of-comprehensive-income</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100080 - Statement - Consolidated Statements of Changes in Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-statements-of-changes-in-shareholders-equity</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100090 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-statements-of-changes-in-shareholders-equity-parentheticals</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100100 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/statement-consolidated-statements-of-cash-flows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecurities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Loans and Allowance for Credit Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLosses</Role>
      <ShortName>Loans and Allowance for Credit Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Mortgage Banking</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBanking</Role>
      <ShortName>Mortgage Banking</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Goodwill and Acquired Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssets</Role>
      <ShortName>Goodwill and Acquired Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Other Real Estate Owned</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOtherRealEstateOwned</Role>
      <ShortName>Other Real Estate Owned</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100180 - Disclosure - Derivatives and Hedging Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivities1</Role>
      <ShortName>Derivatives and Hedging Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100190 - Disclosure - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDeposits</Role>
      <ShortName>Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Subordinated Debentures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSubordinatedDebentures1</Role>
      <ShortName>Subordinated Debentures</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxes1</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRelatedPartyTransactions1</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Stock Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensation</Role>
      <ShortName>Stock Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Condensed Financial Statements of Parent Company</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompany1</Role>
      <ShortName>Condensed Financial Statements of Parent Company</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFinancialInstruments</Role>
      <ShortName>Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Off-Balance Sheet Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOffbalanceSheetActivities1</Role>
      <ShortName>Off-Balance Sheet Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Regulatory Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRegulatoryCapital1</Role>
      <ShortName>Regulatory Capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100330 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecurities</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100350 - Disclosure - Loans and Allowance for Credit Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesTables</Role>
      <ShortName>Loans and Allowance for Credit Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLosses</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Mortgage Banking (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBankingTables</Role>
      <ShortName>Mortgage Banking (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBanking</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Premises and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipmentTables</Role>
      <ShortName>Premises and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipment</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Goodwill and Acquired Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Acquired Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssets</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Other Real Estate Owned (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOtherRealEstateOwnedTables</Role>
      <ShortName>Other Real Estate Owned (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOtherRealEstateOwned</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Derivatives and Hedging Activities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivitiesTables</Role>
      <ShortName>Derivatives and Hedging Activities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivities1</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDepositsTables</Role>
      <ShortName>Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDeposits</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsTables</Role>
      <ShortName>Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowings</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxes1</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Related Party Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRelatedPartyTransactionsTables</Role>
      <ShortName>Related Party Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRelatedPartyTransactions1</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Stock Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensationTables</Role>
      <ShortName>Stock Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensation</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEarningsPerShare</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Condensed Financial Statements of Parent Company (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyTables</Role>
      <ShortName>Condensed Financial Statements of Parent Company (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompany1</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFinancialInstrumentsTables</Role>
      <ShortName>Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFinancialInstruments</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurements</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Off-balance Sheet Activities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOffbalanceSheetActivitiesTables</Role>
      <ShortName>Off-balance Sheet Activities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Regulatory Capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRegulatoryCapitalTables</Role>
      <ShortName>Regulatory Capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRegulatoryCapital1</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100520 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>100530 - Disclosure - Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAccumulatedOtherComprehensiveIncomeDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>100540 - Disclosure - Securities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesAdditionalInformationDetails</Role>
      <ShortName>Securities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>100550 - Disclosure - Securities - Fair Value of Equity Securities and Related Gross Unrealized Gains (Losses) Recognized in Interest Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesFairValueOfEquitySecuritiesAndRelatedGrossUnrealizedGainsLossesRecognizedInInterestIncomeDetails1</Role>
      <ShortName>Securities - Fair Value of Equity Securities and Related Gross Unrealized Gains (Losses) Recognized in Interest Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>100560 - Disclosure - Securities - Fair Value of Debt Security, Available-for-sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesFairValueOfDebtSecurityAvailableforsaleDetails</Role>
      <ShortName>Securities - Fair Value of Debt Security, Available-for-sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>100570 - Disclosure - Securities - Fair Value of Debt Security, Held-to-maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesFairValueOfDebtSecurityHeldtomaturityDetails</Role>
      <ShortName>Securities - Fair Value of Debt Security, Held-to-maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>100580 - Disclosure - Securities - Sales of Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesSalesOfSecuritiesDetails</Role>
      <ShortName>Securities - Sales of Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>100590 - Disclosure - Securities - Contractual Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesContractualMaturitiesDetails</Role>
      <ShortName>Securities - Contractual Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Securities - Carrying Amount of Securities Pledged as Collateral (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesCarryingAmountOfSecuritiesPledgedAsCollateralDetails</Role>
      <ShortName>Securities - Carrying Amount of Securities Pledged as Collateral (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>100610 - Disclosure - Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesSecuritiesWithUnrealizedLossesAggregatedByInvestmentCategoryAndTimeWithUnrealizedLossPositionDetails</Role>
      <ShortName>Securities - Securities with Unrealized Losses Aggregated by Investment Category and Time with Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>100620 - Disclosure - Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesFairValueOfSecuritiesAvailableForSaleAndTheRelatedUnrealizedGainsAndLossesRecognizedInAccumulatedComprehensiveIncomeD</Role>
      <ShortName>Securities - Fair Value of Securities Available for Sale and The Related Unrealized Gains and Losses Recognized in Accumulated Comprehensive Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>100630 - Disclosure - Securities - Unrealized Gains and Losses on Equity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSecuritiesUnrealizedGainsAndLossesOnEquitySecuritiesDetails</Role>
      <ShortName>Securities - Unrealized Gains and Losses on Equity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>100640 - Disclosure - Loans and Allowance for Loan Losses - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForLoanLossesAdditionalInformationDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>100650 - Disclosure - Loans and Allowance for Credit Losses - Loans by Type as Percentage of Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesLoansByTypeAsPercentageOfPortfolioDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Loans by Type as Percentage of Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>100660 - Disclosure - Loans and Allowance for Credit Losses - Acquired Portfolio and The Acquisition Fair Value Adjustments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesAcquiredPortfolioAndTheAcquisitionFairValueAdjustmentsDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Acquired Portfolio and The Acquisition Fair Value Adjustments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>100670 - Disclosure - Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesAllowanceForCreditLossesAndBalancesInLoanPortfolioDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Allowance for Credit Losses and Balances in Loan Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>100680 - Disclosure - Loans and Allowance for Credit Losses - Schedule of Information Regarding Credit Exposure (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfInformationRegardingCreditExposureDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Schedule of Information Regarding Credit Exposure (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>100690 - Disclosure - Loans and Allowance for Credit Losses - Summary of Amortized Cost Basis Loans Modified To Borrowers Experiencing On Financing Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfAmortizedCostBasisLoansModifiedToBorrowersExperiencingOnFinancingReceivableDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Summary of Amortized Cost Basis Loans Modified To Borrowers Experiencing On Financing Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>100700 - Disclosure - Loans and Allowance for Credit Losses - Summary of Trouble Debt Restructurings (TDRs) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesSummaryOfTroubleDebtRestructuringsTdrsDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Summary of Trouble Debt Restructurings (TDRs) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>100710 - Disclosure - Loans and Allowance for Credit Losses - Schedule of Loans for Impairment and Interest Recognized on Impaired Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfLoansForImpairmentAndInterestRecognizedOnImpairedLoansDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Schedule of Loans for Impairment and Interest Recognized on Impaired Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>100720 - Disclosure - Loans and Allowance for Credit Losses - Aging Analysis of Loans by Loan Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesAgingAnalysisOfLoansByLoanCategoryDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Aging Analysis of Loans by Loan Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Loans and Allowance for Credit Losses - Nonaccrual Loans by Loan Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureLoansAndAllowanceForCreditLossesNonaccrualLoansByLoanCategoryDetails</Role>
      <ShortName>Loans and Allowance for Credit Losses - Nonaccrual Loans by Loan Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>100740 - Disclosure - Mortgage Banking - Schedule of Activity in Secondary Market Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBankingScheduleOfActivityInSecondaryMarketLoansDetails</Role>
      <ShortName>Mortgage Banking - Schedule of Activity in Secondary Market Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Mortgage Banking - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBankingAdditionalInformationDetails</Role>
      <ShortName>Mortgage Banking - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100760 - Disclosure - Mortgage Banking - Schedule of Activity for Loan Servicing Rights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureMortgageBankingScheduleOfActivityForLoanServicingRightsDetails</Role>
      <ShortName>Mortgage Banking - Schedule of Activity for Loan Servicing Rights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>100770 - Disclosure - Premises and Equipment - Schedule of Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipmentScheduleOfPremisesAndEquipmentDetails</Role>
      <ShortName>Premises and Equipment - Schedule of Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100780 - Disclosure - Premises and Equipment - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipmentAdditionalInformationDetails</Role>
      <ShortName>Premises and Equipment - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Premises and Equipment - Rent Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosurePremisesAndEquipmentRentCommitmentsDetails</Role>
      <ShortName>Premises and Equipment - Rent Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Goodwill and Acquired Intangible Assets - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssetsAdditionalInformationDetails</Role>
      <ShortName>Goodwill and Acquired Intangible Assets - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssetsScheduleOfGoodwillDetails</Role>
      <ShortName>Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssetsScheduleOfAcquiredIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100830 - Disclosure - Goodwill and Acquired Intangible Assets - Schedule of Estimated Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureGoodwillAndAcquiredIntangibleAssetsScheduleOfEstimatedAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Acquired Intangible Assets - Schedule of Estimated Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Other Real Estate Owned - Activity within Other Real Estate Owned (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOtherRealEstateOwnedActivityWithinOtherRealEstateOwnedDetails</Role>
      <ShortName>Other Real Estate Owned - Activity within Other Real Estate Owned (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100850 - Disclosure - Other Real Estate Owned - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOtherRealEstateOwnedAdditionalInformationDetails</Role>
      <ShortName>Other Real Estate Owned - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>100860 - Disclosure - Derivatives and Hedging Activities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivitiesAdditionalInformationDetails</Role>
      <ShortName>Derivatives and Hedging Activities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100870 - Disclosure - Derivatives and Hedging Activities - Schedule of Derivatives Instruments in Balance Sheet Location (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivitiesScheduleOfDerivativesInstrumentsInBalanceSheetLocationDetails</Role>
      <ShortName>Derivatives and Hedging Activities - Schedule of Derivatives Instruments in Balance Sheet Location (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>100880 - Disclosure - Derivatives and Hedging Activities - Location and Amount of Gain (Loss) in Income on Fair Value and Cash Flow Hedging Relationships (Details) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivitiesLocationAndAmountOfGainLossInIncomeOnFairValueAndCashFlowHedgingRelationshipsDetailsDetails</Role>
      <ShortName>Derivatives and Hedging Activities - Location and Amount of Gain (Loss) in Income on Fair Value and Cash Flow Hedging Relationships (Details) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>100890 - Disclosure - Derivatives and Hedging Activities - Schedule of Cumulative Basis Adjustments on Hedged Items Designated as Fair Value Hedges and Related Amortized Cost (Details) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDerivativesAndHedgingActivitiesScheduleOfCumulativeBasisAdjustmentsOnHedgedItemsDesignatedAsFairValueHedgesAndRelatedAmortizedC</Role>
      <ShortName>Derivatives and Hedging Activities - Schedule of Cumulative Basis Adjustments on Hedged Items Designated as Fair Value Hedges and Related Amortized Cost (Details) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>100900 - Disclosure - Deposits - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDepositsAdditionalInformationDetails</Role>
      <ShortName>Deposits - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>100910 - Disclosure - Deposits - Deposit Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDepositsDepositBalancesDetails</Role>
      <ShortName>Deposits - Deposit Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>100920 - Disclosure - Deposits - Maturities of Certificate of Deposit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureDepositsMaturitiesOfCertificateOfDepositDetails</Role>
      <ShortName>Deposits - Maturities of Certificate of Deposit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>100930 - Disclosure - Borrowings - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails</Role>
      <ShortName>Borrowings - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>100940 - Disclosure - Borrowings - Schedule of Bank Term Funding Program Advances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsScheduleOfBankTermFundingProgramAdvancesDetails</Role>
      <ShortName>Borrowings - Schedule of Bank Term Funding Program Advances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>100950 - Disclosure - Borrowings - Schedule of Bank Term Funding Program Advances (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsScheduleOfBankTermFundingProgramAdvancesParentheticalDetails</Role>
      <ShortName>Borrowings - Schedule of Bank Term Funding Program Advances (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>100960 - Disclosure - Borrowings - Schedule of Federal Home Loan Bank Advances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsScheduleOfFederalHomeLoanBankAdvancesDetails</Role>
      <ShortName>Borrowings - Schedule of Federal Home Loan Bank Advances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>100970 - Disclosure - Borrowings - Schedule of Federal Home Loan Bank Advances (Parentheticals) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureBorrowingsScheduleOfFederalHomeLoanBankAdvancesParentheticalsDetails</Role>
      <ShortName>Borrowings - Schedule of Federal Home Loan Bank Advances (Parentheticals) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>100980 - Disclosure - Subordinated Debentures - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureSubordinatedDebenturesAdditionalInformationDetails</Role>
      <ShortName>Subordinated Debentures - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>100990 - Disclosure - Income Taxes - Reconciliation of Effective Income Tax Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxesReconciliationOfEffectiveIncomeTaxRateDetails</Role>
      <ShortName>Income Taxes - Reconciliation of Effective Income Tax Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>101000 - Disclosure - Income Taxes - Reconciliation of Effective Income Tax Rate (Parentheticals) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxesReconciliationOfEffectiveIncomeTaxRateParentheticalsDetails</Role>
      <ShortName>Income Taxes - Reconciliation of Effective Income Tax Rate (Parentheticals) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>101010 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income Taxes - Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>101020 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>101030 - Disclosure - Related Party Transactions - Loans to Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRelatedPartyTransactionsLoansToRelatedPartiesDetails</Role>
      <ShortName>Related Party Transactions - Loans to Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>101040 - Disclosure - Related Party Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails</Role>
      <ShortName>Related Party Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>102</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>101050 - Disclosure - Employee Benefit Plans - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEmployeeBenefitPlansAdditionalInformationDetails</Role>
      <ShortName>Employee Benefit Plans - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>103</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>101060 - Disclosure - Stock Based Compensation - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformationDetails</Role>
      <ShortName>Stock Based Compensation - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>104</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R105.htm</HtmlFileName>
      <LongName>101070 - Disclosure - Stock Based Compensation - Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensationStockOptionActivityDetails</Role>
      <ShortName>Stock Based Compensation - Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>105</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R106.htm</HtmlFileName>
      <LongName>101080 - Disclosure - Stock Based Compensation - Stock Options Outstanding By Exercise Price Range (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensationStockOptionsOutstandingByExercisePriceRangeDetails</Role>
      <ShortName>Stock Based Compensation - Stock Options Outstanding By Exercise Price Range (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>106</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R107.htm</HtmlFileName>
      <LongName>101090 - Disclosure - Stock Based Compensation - Summary of Activity for Stock Units Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureStockBasedCompensationSummaryOfActivityForStockUnitsOutstandingDetails</Role>
      <ShortName>Stock Based Compensation - Summary of Activity for Stock Units Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>107</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R108.htm</HtmlFileName>
      <LongName>101100 - Disclosure - Earnings Per Share - Schedule of Basic Earnings Per Share and Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEarningsPerShareScheduleOfBasicEarningsPerShareAndDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share - Schedule of Basic Earnings Per Share and Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>108</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R109.htm</HtmlFileName>
      <LongName>101110 - Disclosure - Earnings Per Share - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureEarningsPerShareAdditionalInformationDetails</Role>
      <ShortName>Earnings Per Share - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>109</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R110.htm</HtmlFileName>
      <LongName>101120 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedBalanceSheetsDetails</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Balance Sheets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>110</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R111.htm</HtmlFileName>
      <LongName>101130 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedStatementsOfIncomeDetails</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Statements of Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>111</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R112.htm</HtmlFileName>
      <LongName>101140 - Disclosure - Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureCondensedFinancialStatementsOfParentCompanyCondensedStatementsOfCashFlowsDetails</Role>
      <ShortName>Condensed Financial Statements of Parent Company - Condensed Statements of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>112</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R113.htm</HtmlFileName>
      <LongName>101150 - Disclosure - Financial Instruments - Summary of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFinancialInstrumentsSummaryOfFinancialInstrumentsDetails</Role>
      <ShortName>Financial Instruments - Summary of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>113</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R114.htm</HtmlFileName>
      <LongName>101160 - Disclosure - Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurementsScheduleOfAssetsAndLiabilitiesMeasuredAtFairValueDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>114</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R115.htm</HtmlFileName>
      <LongName>101170 - Disclosure - Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurementsChangesInLevel3AssetsMeasuredAtFairValueOnARecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>115</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R116.htm</HtmlFileName>
      <LongName>101180 - Disclosure - Fair Value Measurements - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetails</Role>
      <ShortName>Fair Value Measurements - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>116</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R117.htm</HtmlFileName>
      <LongName>101190 - Disclosure - Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureFairValueMeasurementsAssetsMeasuredAtFairValueOnANonrecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Assets Measured at Fair Value on a Non-recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>117</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R118.htm</HtmlFileName>
      <LongName>101200 - Disclosure - Off-balance Sheet Activities - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOffbalanceSheetActivitiesAdditionalInformationDetails</Role>
      <ShortName>Off-balance Sheet Activities - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>118</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R119.htm</HtmlFileName>
      <LongName>101210 - Disclosure - Off-balance Sheet Activities - Schedule of Financial Instruments with Off-Balance Sheet Risk (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureOffbalanceSheetActivitiesScheduleOfFinancialInstrumentsWithOffbalanceSheetRiskDetails</Role>
      <ShortName>Off-balance Sheet Activities - Schedule of Financial Instruments with Off-Balance Sheet Risk (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>119</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R120.htm</HtmlFileName>
      <LongName>101220 - Disclosure - Regulatory Capital - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRegulatoryCapitalAdditionalInformationDetails</Role>
      <ShortName>Regulatory Capital - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>120</Position>
    </Report>
    <Report instance="cofs-20231231.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R121.htm</HtmlFileName>
      <LongName>101230 - Disclosure - Regulatory Capital - Regulatory Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.choiceone.bank/20231231/taxonomy/role/DisclosureRegulatoryCapitalRegulatoryCapitalDetails</Role>
      <ShortName>Regulatory Capital - Regulatory Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>121</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-K" isDefinitelyFs="true" isUsgaap="true" original="cofs-20231231.htm">cofs-20231231.htm</File>
    <File>cofs-20231231.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="3">http://fasb.org/srt/2023</BaseTaxonomy>
    <BaseTaxonomy items="2634">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="38">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
