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Cash and Cash Equivalents (Details Textual) $ in Millions	Dec. 31, 2025 USD ($)
Cash and Cash Equivalents [Line Items]
Cash in excess of limits of FDIC insurance coverage	$ 1.5
Federal Home Loan Bank of Chicago
Cash and Cash Equivalents [Line Items]
Cash held	442.4
Federal Home Loan Bank of Indianapolis
Cash and Cash Equivalents [Line Items]
Cash held	$ 7.6

X

- Definition

The sum of cash and cash equivalents interest-bearing cash accounts did not exceed the limits for full FDIC insurance coverage.

+ References

No definition available.

+ Details

Name:	inbk_InterestbearingCashAndCashEquivalents
Namespace Prefix:	inbk_
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

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

X

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfChicagoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfIndianapolisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: