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Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Available-for-sale securities, gross realized gain (loss)	$ 41	$ 0
Continuous unrealized loss position, fair value	$ 205,100			$ 317,500
Continuous unrealized loss position, fair value (as a percent)	30.00%		53.00%

X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position in percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Securities, Continuous Unrealized Loss Position, Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	inbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563

+ Details

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X

- References

No definition available.

+ Details

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