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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Mar. 10, 2023
Jun. 30, 2022
Class of Stock [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-35750    
Entity Registrant Name First Internet Bancorp    
Entity Incorporation, State or Country Code IN    
Entity Tax Identification Number 20-3489991    
Entity Address, Address Line One 8701 E. 116th Street    
Entity Address, City or Town Fishers    
Entity Address, State or Province IN    
Entity Address, Postal Zip Code 46038    
City Area Code 317    
Local Phone Number 532-7900    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 284.3
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   8,949,423  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) FY    
Document Fiscal Year Focus 2022    
Amendment Flag false    
Entity Central Index Key 0001562463    
Documents Incorporated by Reference
Documents Incorporated By Reference
 
Portions of our definitive proxy statement for our 2023 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated.
    
Common Stock      
Class of Stock [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 2029      
Class of Stock [Line Items]      
Title of 12(b) Security 6.0% Fixed to Floating Subordinated Notes due 2029    
Trading Symbol INBKZ    
Security Exchange Name NASDAQ