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v3.26.1

Benefit Plans - Deferred Stock Rights (Details) | 6 Months Ended
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Jun. 30, 2026 shares
Deferred Stock Rights |
Outstanding, beginning of period (in shares) | 29,013
Granted (in shares) | 169
Outstanding, end of period (in shares) | 29,182

X
- Definition It represents the deferred stock rights granted to directors during the period related to deferred stock plan. + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the outstanding number of deferred stock rights related to directors deferred stock plan. + References No definition available. + Details
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Namespace Prefix: | inbk_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration