<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.22.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>292</ContextCount>
  <ElementCount>358</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>66</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000100 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010000 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/ConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>010100 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>020000 - Statement - Consolidated Statements of Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/ConsolidatedStatementsOfIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>030000 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>040000 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/ConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>060100 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>060200 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>060300 - Disclosure - Loans and Allowance for Loan Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLosses</Role>
      <ShortName>Loans and Allowance for Loan Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>060400 - Disclosure - Premises and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/PremisesAndEquipment</Role>
      <ShortName>Premises and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>060500 - Disclosure - Deposits</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/Deposits</Role>
      <ShortName>Deposits</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>060600 - Disclosure - SBA Servicing Asset</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SbaServicingAsset</Role>
      <ShortName>SBA Servicing Asset</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>060700 - Disclosure - Capital Requirements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CapitalRequirements</Role>
      <ShortName>Capital Requirements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>060800 - Disclosure - Commitments and Contingent Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CommitmentsAndContingentLiabilities</Role>
      <ShortName>Commitments and Contingent Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>060900 - Disclosure - Investment in Business Funding Group, LLC</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentInBusinessFundingGroupLlc</Role>
      <ShortName>Investment in Business Funding Group, LLC</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>061000 - Disclosure - Stock-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/StockbasedCompensation</Role>
      <ShortName>Stock-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>061100 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>061200 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>061300 - Disclosure - Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/RelatedParties</Role>
      <ShortName>Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>061400 - Disclosure - Earnings per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/EarningsPerShare</Role>
      <ShortName>Earnings per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>061500 - Disclosure - Revenue Recognition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/RevenueRecognition</Role>
      <ShortName>Revenue Recognition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>061600 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>070100 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>080200 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/Investments</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>080300 - Disclosure - Loans and Allowance for Loan Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesTables</Role>
      <ShortName>Loans and Allowance for Loan Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLosses</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>080400 - Disclosure - Premises and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/PremisesAndEquipmentTables</Role>
      <ShortName>Premises and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/PremisesAndEquipment</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>080500 - Disclosure - Deposits (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/DepositsTables</Role>
      <ShortName>Deposits (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/Deposits</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>080600 - Disclosure - SBA Servicing Asset (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SbaServicingAssetTables</Role>
      <ShortName>SBA Servicing Asset (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/SbaServicingAsset</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>080700 - Disclosure - Capital Requirements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CapitalRequirementsTables</Role>
      <ShortName>Capital Requirements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/CapitalRequirements</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>080800 - Disclosure - Commitments and Contingent Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CommitmentsAndContingentLiabilitiesTables</Role>
      <ShortName>Commitments and Contingent Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/CommitmentsAndContingentLiabilities</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>081000 - Disclosure - Stock-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/StockbasedCompensationTables</Role>
      <ShortName>Stock-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/StockbasedCompensation</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>081100 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/FairValueOfFinancialInstruments</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>081400 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>081500 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/RevenueRecognition</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>090100 - Disclosure - Summary of Significant Accounting Policies, Nature of Business and Organization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesNatureOfBusinessAndOrganizationDetails</Role>
      <ShortName>Summary of Significant Accounting Policies, Nature of Business and Organization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>090104 - Disclosure - Summary of Significant Accounting Policies, COVID-19 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesCovid19Details</Role>
      <ShortName>Summary of Significant Accounting Policies, COVID-19 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>090106 - Disclosure - Summary of Significant Accounting Policies, Out-of-Period Adjustment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesOutofperiodAdjustmentDetails</Role>
      <ShortName>Summary of Significant Accounting Policies, Out-of-Period Adjustment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>090114 - Disclosure - Summary of Significant Accounting Policies, Recently adopted accounting pronouncements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SummaryOfSignificantAccountingPoliciesRecentlyAdoptedAccountingPronouncementsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies, Recently adopted accounting pronouncements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>090200 - Disclosure - Investments, Held-to-Maturity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentsHeldtomaturitySecuritiesDetails</Role>
      <ShortName>Investments, Held-to-Maturity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>090202 - Disclosure - Investments, Unrealized Loss Position (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentsUnrealizedLossPositionDetails</Role>
      <ShortName>Investments, Unrealized Loss Position (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>090204 - Disclosure - Investments, Amortized Cost and Estimated Market Value of Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentsAmortizedCostAndEstimatedMarketValueOfDebtSecuritiesDetails</Role>
      <ShortName>Investments, Amortized Cost and Estimated Market Value of Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>090206 - Disclosure - Investments, FHLB Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentsFhlbStockDetails</Role>
      <ShortName>Investments, FHLB Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>090300 - Disclosure - Loans and Allowance for Loan Losses, Loans Summarized to Major Risk Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesLoansSummarizedToMajorRiskCategoryDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Loans Summarized to Major Risk Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>090304 - Disclosure - Loans and Allowance for Loan Losses, Strategic Program Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesStrategicProgramLoansDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Strategic Program Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>090306 - Disclosure - Loans and Allowance for Loan Losses, Changes in Allowance for Loan Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesChangesInAllowanceForLoanLossesDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Changes in Allowance for Loan Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>090308 - Disclosure - Loans and Allowance for Loan Losses, Impaired Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesImpairedLoansDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Impaired Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>090310 - Disclosure - Loans and Allowance for Loan Losses, Nonaccrual and Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesNonaccrualAndPastDueLoansDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Nonaccrual and Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>090312 - Disclosure - Loans and Allowance for Loan Losses, Outstanding Loan Balances Categorized by Credit Quality Indicators (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesOutstandingLoanBalancesCategorizedByCreditQualityIndicatorsDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, Outstanding Loan Balances Categorized by Credit Quality Indicators (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>090314 - Disclosure - Loans and Allowance for Loan Losses, TDR's (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesTdrSDetails</Role>
      <ShortName>Loans and Allowance for Loan Losses, TDR's (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/LoansAndAllowanceForLoanLossesTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>090400 - Disclosure - Premises and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/PremisesAndEquipmentDetails</Role>
      <ShortName>Premises and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/PremisesAndEquipmentTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>090500 - Disclosure - Deposits (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/DepositsDetails</Role>
      <ShortName>Deposits (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/DepositsTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>090600 - Disclosure - SBA Servicing Asset (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/SbaServicingAssetDetails</Role>
      <ShortName>SBA Servicing Asset (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/SbaServicingAssetTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>090700 - Disclosure - Capital Requirements, Actual Capital Amounts and Ratios (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CapitalRequirementsActualCapitalAmountsAndRatiosDetails</Role>
      <ShortName>Capital Requirements, Actual Capital Amounts and Ratios (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>090800 - Disclosure - Commitments and Contingent Liabilities, Federal Home Loan Bank Secured Line of Credit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CommitmentsAndContingentLiabilitiesFederalHomeLoanBankSecuredLineOfCreditDetails</Role>
      <ShortName>Commitments and Contingent Liabilities, Federal Home Loan Bank Secured Line of Credit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>090802 - Disclosure - Commitments and Contingent Liabilities, Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/CommitmentsAndContingentLiabilitiesFinancialInstrumentsDetails</Role>
      <ShortName>Commitments and Contingent Liabilities, Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>090900 - Disclosure - Investment in Business Funding Group, LLC (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/InvestmentInBusinessFundingGroupLlcDetails</Role>
      <ShortName>Investment in Business Funding Group, LLC (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/InvestmentInBusinessFundingGroupLlc</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>091000 - Disclosure - Stock-Based Compensation, Summary (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/StockbasedCompensationSummaryDetails</Role>
      <ShortName>Stock-Based Compensation, Summary (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>091004 - Disclosure - Stock-Based Compensation, Stock Option Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/StockbasedCompensationStockOptionActivityDetails</Role>
      <ShortName>Stock-Based Compensation, Stock Option Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>091008 - Disclosure - Stock-Based Compensation, Stock-Based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/StockbasedCompensationStockbasedCompensationExpenseDetails</Role>
      <ShortName>Stock-Based Compensation, Stock-Based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>091100 - Disclosure - Fair Value of Financial Instruments, Estimated Fair Value and Carrying Value of Financial Instrument (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/FairValueOfFinancialInstrumentsEstimatedFairValueAndCarryingValueOfFinancialInstrumentDetails</Role>
      <ShortName>Fair Value of Financial Instruments, Estimated Fair Value and Carrying Value of Financial Instrument (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>091102 - Disclosure - Fair Value of Financial Instruments, Assets Measured on Non-recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/FairValueOfFinancialInstrumentsAssetsMeasuredOnNonrecurringBasisDetails</Role>
      <ShortName>Fair Value of Financial Instruments, Assets Measured on Non-recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>091104 - Disclosure - Fair Value of Financial Instruments, Quantitative Information for Level 3 Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/FairValueOfFinancialInstrumentsQuantitativeInformationForLevel3FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value of Financial Instruments, Quantitative Information for Level 3 Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>091204 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/IncomeTaxes</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>091300 - Disclosure - Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/RelatedPartiesDetails</Role>
      <ShortName>Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/RelatedParties</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>091400 - Disclosure - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/EarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/EarningsPerShareTables</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="form10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>091500 - Disclosure - Revenue Recognition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://finwisebancorp.com/role/RevenueRecognitionDetails</Role>
      <ShortName>Revenue Recognition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://finwisebancorp.com/role/RevenueRecognitionTables</ParentRole>
      <Position>66</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-Q" original="form10q.htm">form10q.htm</File>
    <File>brhc10037731_ex10-2.htm</File>
    <File>brhc10037731_ex10-3.htm</File>
    <File>brhc10037731_ex31-1.htm</File>
    <File>brhc10037731_ex31-2.htm</File>
    <File>brhc10037731_ex32-1.htm</File>
    <File>finw-20220331.xsd</File>
    <File>finw-20220331_cal.xml</File>
    <File>finw-20220331_def.xml</File>
    <File>finw-20220331_lab.xml</File>
    <File>finw-20220331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="961">http://fasb.org/us-gaap/2021-01-31</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2021q4</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
