XML 9 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Cover
Oct. 26, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 26, 2020
Entity File Number 001-35750
Entity Registrant Name First Internet Bancorp
Entity Central Index Key 0001562463
Entity Tax Identification Number 20-3489991
Entity Incorporation, State or Country Code IN
Entity Address, Address Line One 11201 USA Parkway
Entity Address, City or Town Fishers
Entity Address, State or Province IN
Entity Address, Postal Zip Code 46037
City Area Code 317
Local Phone Number 532-7900
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, without par value
Trading Symbol INBK
Security Exchange Name NASDAQ
6.0% Fixed to Floating Subordinated Notes due 2026  
Document Information [Line Items]  
Title of 12(b) Security 6.0% Fixed to Floating Subordinated Notes due 2026
Trading Symbol INBKL
Security Exchange Name NASDAQ
6.0% Fixed to Floating Subordinated Notes due 2029  
Document Information [Line Items]  
Title of 12(b) Security 6.0% Fixed to Floating Subordinated Notes due 2029
Trading Symbol INBKZ
Security Exchange Name NASDAQ