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Servicing Asset - Unpaid principal balance (Details) - Loan servicing - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]
Loans serviced for others	$ 103,878	$ 103,981
SBA guaranteed loans
Servicing Assets at Fair Value [Line Items]
Loans serviced for others	$ 103,878	$ 103,981

X

- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=inbk_LoanServicingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=inbk_SBAGuaranteedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: