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Cover Page - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Aug. 06, 2020
Cover [Abstract]      
Document Type 10-Q    
Document Quarterly Report   true  
Document Period End Date Jun. 30, 2020    
Document Transition Report   false  
Entity File Number 000-10661    
Entity Registrant Name   TriCo Bancshares  
Entity Incorporation, State or Country Code   CA  
Entity Tax Identification Number   94-2792841  
Entity Address, Address Line One 63 Constitution Drive    
Entity Address, City or Town Chico    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 95973    
City Area Code 530    
Local Phone Number 898-0300    
Title of 12(b) Security   Common Stock  
Trading Symbol   TCBK  
Security Exchange Name   NASDAQ  
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  
Entity Shell Company   false  
Entity Common Stock, Shares Outstanding     29,759,209
Amendment Flag   false  
Document Fiscal Year Focus   2020  
Document Fiscal Period Focus   Q2  
Current Fiscal Year End Date   --12-31  
Entity Central Index Key   0000356171