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v3.21.2

Premises and Equipment - Narrative (Details) - Agreement To Sell Headquarters And Certain Equipment $ in Millions | Apr. 16, 2021 USD ($)
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Property, Plant and Equipment [Line Items] |
Option to extend lease, period | 90 days
Sale price paid in cash | $ 8.9

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- Definition Sale Leaseback Transaction, Lease Terms, Option To Extend, Period + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=inbk_AgreementToSellHeadquartersAndCertainEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |