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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 16, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38487    
Entity Registrant Name Origin Bancorp, Inc.    
Entity Incorporation, State or Country Code LA    
Entity Tax Identification Number 72-1192928    
Entity Address, Address Line One 500 South Service Road East    
Entity Address, City or Town Ruston    
Entity Address, State or Province LA    
Entity Address, Postal Zip Code 71270    
City Area Code 318    
Local Phone Number 255-2222    
Title of 12(b) Security Common Stock, par value $5.00 per share    
Trading Symbol OBNK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 937.8
Entity Common Stock, Shares Outstanding (in shares)   23,748,748  
Documents Incorporated by Reference Portions of the registrant's Definitive Proxy Statement for the 2022 Annual Meeting of Stockholders of Origin Bancorp, Inc. to be held on April 27, 2022, are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant's fiscal year ended December 31, 2021.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity CIK 0001516912