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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 26, 2020
Jun. 30, 2019
Document Information [Line Items]      
Entity Registrant Name LIVE OAK BANCSHARES, INC.    
Entity Central Index Key 0001462120    
Trading Symbol LOB    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Voluntary Files No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 518,033,826
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer No    
Title of 12(b) Security Voting Common Stock, no par value per share    
Security Exchange Name NASDAQ    
Entity File Number 001-37497    
Entity Incorporation, State or Country Code NC    
Entity Tax Identification Number 26-4596286    
Entity Address, Address Line One 1741 Tiburon Drive    
Entity Address, City or Town Wilmington    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28403    
City Area Code 910    
Local Phone Number 790-5867    
Document Transition Report false    
Document Annual Report true    
Documents Incorporated by Reference

Portions of the registrant's definitive proxy statement for the 2020 Annual Meeting of Shareholders, which the registrant plans to file subsequent to the date hereof, are incorporated by reference into Part III.  Portions of the registrant's annual report to shareholders for the year ended December 31, 2019, which will be posted on the registrant's website subsequent to the date hereof, are incorporated by reference into Part II.

    
Entity Voting Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   37,616,203  
Entity Nonvoting Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   2,715,531