XML 41 R1.htm IDEA: XBRL DOCUMENT v3.21.1
Cover
 3 Months Ended
Apr. 28, 2021
Jan. 27, 2021
Mar. 31, 2021
Cover [Abstract]      
Document Type 8-K    
Document Period End Date Apr. 28, 2021    
Entity Registrant Name     TriCo Bancshares
Entity Incorporation, State or Country Code     CA
Entity File Number     0-10661
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
Written Communications false    
Soliciting Material false    
Pre-commencement Tender Offer false    
Pre-commencement Issuer Tender Offer false    
Title of 12(b) Security     Common Stock, no par value
Trading Symbol     TCBK
Security Exchange Name     NASDAQ
Entity Emerging Growth Company   false  
Amendment Flag     false
Entity Central Index Key 0000356171