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v3.21.2

Loans - Deferrals (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2020 security | Sep. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of deferrals | security | 0 |
Payment Deferral | COVID-19 Modification |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Non-TDR loan modifications due to COVID-19 | $ |  | $ 3.0

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- Definition Financing Receivable, Modifications, Balance + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |